Stage 4: guided Player for both Modes and the Session summary

- buildSegments lays a Plan out as holds with Transitions (get ready,
  switch sides, next round, next exercise) or sets with count-up Rests;
  Supersets alternate members and rest per round unless asked otherwise
- SessionRunner drives segments against an injected clock: auto-advance
  with a chime, pause, skip, back, rep sets confirmed with logged reps
  and kg, timed sets started on demand, early end
- Player screen: countdown ring, accent pulse in the last 3 s, Flip
  Animation, next-up cards, Rest Screen, mute toggle, screen kept on
- Sessions table (schema v2 migration) keeps a Plan snapshot and Set
  Logs; nothing is saved when no hold or set was done
- Summary with time, exercises or sets logged, and every Set Log
- Synthesised quiet cue sounds (tools/sounds), status bar per Mode

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

GLOSSARY.md

@@ -55,14 +55,16 @@ In Workout Mode, the screen after "Set done": a count-up timer ("Resting 1:12")
 button. Nothing counts down. Timed sets start only when the user taps Start.
 
 **Transition**:
-In Stretching Mode, a short card between rounds, sides ("Switch sides") and Exercises, after which the
+In Stretching Mode, a short card before the first hold ("Get ready") and between rounds, sides
-next hold starts automatically. Length set per Plan, 5 s by default.
+("Switch sides") and Exercises, after which the next hold starts automatically. Its length is the
+Plan's "pause between holds", 5 s by default; 0 s means no Transitions.
 
 ## Sessions
 
 **Session**:
 One run-through of a Plan in the Player. It stores a snapshot of the Plan, so later edits to the Plan
-never change it. A Session is **complete** or **incomplete** (ended early).
+never change it. A Session is **complete** (reached the end) or **incomplete** (ended early). A Session
+in which no hold or set was actually done is not saved at all.
 _Avoid_: Workout, run
 
 **Player**:

lib/main.dart

@@ -6,7 +6,9 @@ import 'package:provider/provider.dart';
 import 'src/app.dart';
 import 'src/database/database.dart';
 import 'src/exercises/exercise_library.dart';
+import 'src/history/session_repository.dart';
 import 'src/plans/plan_repository.dart';
+import 'src/player/player_effects.dart';
 import 'src/settings/settings_controller.dart';
 
 void main() async {
@@ -24,6 +26,8 @@ void main() async {
         ChangeNotifierProvider.value(value: settings),
         Provider.value(value: library),
         Provider.value(value: PlanRepository(db)),
+        Provider.value(value: SessionRepository(db)),
+        Provider<PlayerEffects>(create: (_) => DevicePlayerEffects()),
       ],
       child: const ZenXerciseApp(),
     ),

lib/src/app.dart

@@ -1,4 +1,5 @@
 import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
 import 'package:flutter_localizations/flutter_localizations.dart';
 import 'package:provider/provider.dart';
 
@@ -9,6 +10,8 @@ import 'home/home_view.dart';
 import 'localization/app_localizations.dart';
 import 'plans/views/exercise_picker_view.dart';
 import 'plans/views/plan_editor_view.dart';
+import 'player/views/player_view.dart';
+import 'player/views/summary_view.dart';
 import 'settings/settings_controller.dart';
 
 class ZenXerciseApp extends StatelessWidget {
@@ -32,12 +35,19 @@ class ZenXerciseApp extends StatelessWidget {
       ],
       supportedLocales: AppLocalizations.supportedLocales,
       onGenerateTitle: (context) => AppLocalizations.of(context).appTitle,
+      // Status bar icons follow the Mode's ground on every screen, with or without an app bar.
+      builder: (context, child) => AnnotatedRegion<SystemUiOverlayStyle>(
+        value: style.brightness == Brightness.dark ? SystemUiOverlayStyle.light : SystemUiOverlayStyle.dark,
+        child: child!,
+      ),
       onGenerateRoute: (settings) => MaterialPageRoute<Object?>(
         settings: settings,
         builder: (context) => switch (settings.name) {
           ExerciseDetailView.routeName => ExerciseDetailView(exerciseId: settings.arguments! as String),
           PlanEditorView.routeName => PlanEditorView(planId: settings.arguments! as String),
           ExercisePickerView.routeName => ExercisePickerView(planId: settings.arguments! as String),
+          PlayerView.routeName => PlayerView(planId: settings.arguments! as String),
+          SummaryView.routeName => SummaryView(sessionId: settings.arguments! as String),
           _ => const HomeView(),
         },
       ),

lib/src/database/database.dart

@@ -1,6 +1,9 @@
+import 'dart:convert';
+
 import 'package:drift/drift.dart';
 
 import '../plans/models/plan.dart';
+import '../player/session_runner.dart';
 
 part 'database.g.dart';
 
@@ -32,10 +35,51 @@ class PlanItemsConverter extends TypeConverter<List<PlanItem>, String> {
   String toSql(List<PlanItem> value) => PlanItem.listToJson(value);
 }
 
-@DriftDatabase(tables: [Plans])
+/// One row per finished Session, complete or ended early. It keeps a snapshot
+/// of the Plan, so editing or deleting the Plan never changes History.
+@DataClassName('SessionRow')
+class Sessions extends Table {
+  TextColumn get id => text()();
+  TextColumn get mode => text()();
+
+  /// The Plan it ran, if that still matters; no foreign key, so deleting the Plan keeps its Sessions.
+  TextColumn get planId => text()();
+  TextColumn get planName => text()();
+  TextColumn get items => text().map(const PlanItemsConverter())();
+  DateTimeColumn get startedAt => dateTime()();
+  DateTimeColumn get endedAt => dateTime()();
+  IntColumn get durationSeconds => integer()();
+  BoolColumn get complete => boolean()();
+  TextColumn get setLogs => text().map(const SetLogsConverter())();
+
+  @override
+  Set<Column> get primaryKey => {id};
+}
+
+class SetLogsConverter extends TypeConverter<List<SetLog>, String> {
+  const SetLogsConverter();
+
+  @override
+  List<SetLog> fromSql(String fromDb) => [
+    for (final l in jsonDecode(fromDb) as List) SetLog.fromJson((l as Map).cast<String, Object?>()),
+  ];
+
+  @override
+  String toSql(List<SetLog> value) => jsonEncode([for (final l in value) l.toJson()]);
+}
+
+@DriftDatabase(tables: [Plans, Sessions])
 class AppDatabase extends _$AppDatabase {
   AppDatabase(super.e);
 
   @override
-  int get schemaVersion => 1;
+  int get schemaVersion => 2;
+
+  @override
+  MigrationStrategy get migration => MigrationStrategy(
+    onUpgrade: (m, from, to) async {
+      // 2: Sessions.
+      if (from < 2) await m.createTable(sessions);
+    },
+  );
 }

lib/src/database/database.g.dart

@@ -399,14 +399,536 @@ class PlansCompanion extends UpdateCompanion<PlanRow> {
   }
 }
 
+class $SessionsTable extends Sessions with TableInfo<$SessionsTable, SessionRow> {
+  @override
+  final GeneratedDatabase attachedDatabase;
+  final String? _alias;
+  $SessionsTable(this.attachedDatabase, [this._alias]);
+  static const VerificationMeta _idMeta = const VerificationMeta('id');
+  @override
+  late final GeneratedColumn<String> id = GeneratedColumn<String>(
+    'id',
+    aliasedName,
+    false,
+    type: DriftSqlType.string,
+    requiredDuringInsert: true,
+  );
+  static const VerificationMeta _modeMeta = const VerificationMeta('mode');
+  @override
+  late final GeneratedColumn<String> mode = GeneratedColumn<String>(
+    'mode',
+    aliasedName,
+    false,
+    type: DriftSqlType.string,
+    requiredDuringInsert: true,
+  );
+  static const VerificationMeta _planIdMeta = const VerificationMeta('planId');
+  @override
+  late final GeneratedColumn<String> planId = GeneratedColumn<String>(
+    'plan_id',
+    aliasedName,
+    false,
+    type: DriftSqlType.string,
+    requiredDuringInsert: true,
+  );
+  static const VerificationMeta _planNameMeta = const VerificationMeta('planName');
+  @override
+  late final GeneratedColumn<String> planName = GeneratedColumn<String>(
+    'plan_name',
+    aliasedName,
+    false,
+    type: DriftSqlType.string,
+    requiredDuringInsert: true,
+  );
+  @override
+  late final GeneratedColumnWithTypeConverter<List<PlanItem>, String> items = GeneratedColumn<String>(
+    'items',
+    aliasedName,
+    false,
+    type: DriftSqlType.string,
+    requiredDuringInsert: true,
+  ).withConverter<List<PlanItem>>($SessionsTable.$converteritems);
+  static const VerificationMeta _startedAtMeta = const VerificationMeta('startedAt');
+  @override
+  late final GeneratedColumn<DateTime> startedAt = GeneratedColumn<DateTime>(
+    'started_at',
+    aliasedName,
+    false,
+    type: DriftSqlType.dateTime,
+    requiredDuringInsert: true,
+  );
+  static const VerificationMeta _endedAtMeta = const VerificationMeta('endedAt');
+  @override
+  late final GeneratedColumn<DateTime> endedAt = GeneratedColumn<DateTime>(
+    'ended_at',
+    aliasedName,
+    false,
+    type: DriftSqlType.dateTime,
+    requiredDuringInsert: true,
+  );
+  static const VerificationMeta _durationSecondsMeta = const VerificationMeta('durationSeconds');
+  @override
+  late final GeneratedColumn<int> durationSeconds = GeneratedColumn<int>(
+    'duration_seconds',
+    aliasedName,
+    false,
+    type: DriftSqlType.int,
+    requiredDuringInsert: true,
+  );
+  static const VerificationMeta _completeMeta = const VerificationMeta('complete');
+  @override
+  late final GeneratedColumn<bool> complete = GeneratedColumn<bool>(
+    'complete',
+    aliasedName,
+    false,
+    type: DriftSqlType.bool,
+    requiredDuringInsert: true,
+    defaultConstraints: GeneratedColumn.constraintIsAlways('CHECK ("complete" IN (0, 1))'),
+  );
+  @override
+  late final GeneratedColumnWithTypeConverter<List<SetLog>, String> setLogs = GeneratedColumn<String>(
+    'set_logs',
+    aliasedName,
+    false,
+    type: DriftSqlType.string,
+    requiredDuringInsert: true,
+  ).withConverter<List<SetLog>>($SessionsTable.$convertersetLogs);
+  @override
+  List<GeneratedColumn> get $columns => [
+    id,
+    mode,
+    planId,
+    planName,
+    items,
+    startedAt,
+    endedAt,
+    durationSeconds,
+    complete,
+    setLogs,
+  ];
+  @override
+  String get aliasedName => _alias ?? actualTableName;
+  @override
+  String get actualTableName => $name;
+  static const String $name = 'sessions';
+  @override
+  VerificationContext validateIntegrity(Insertable<SessionRow> instance, {bool isInserting = false}) {
+    final context = VerificationContext();
+    final data = instance.toColumns(true);
+    if (data.containsKey('id')) {
+      context.handle(_idMeta, id.isAcceptableOrUnknown(data['id']!, _idMeta));
+    } else if (isInserting) {
+      context.missing(_idMeta);
+    }
+    if (data.containsKey('mode')) {
+      context.handle(_modeMeta, mode.isAcceptableOrUnknown(data['mode']!, _modeMeta));
+    } else if (isInserting) {
+      context.missing(_modeMeta);
+    }
+    if (data.containsKey('plan_id')) {
+      context.handle(_planIdMeta, planId.isAcceptableOrUnknown(data['plan_id']!, _planIdMeta));
+    } else if (isInserting) {
+      context.missing(_planIdMeta);
+    }
+    if (data.containsKey('plan_name')) {
+      context.handle(_planNameMeta, planName.isAcceptableOrUnknown(data['plan_name']!, _planNameMeta));
+    } else if (isInserting) {
+      context.missing(_planNameMeta);
+    }
+    if (data.containsKey('started_at')) {
+      context.handle(_startedAtMeta, startedAt.isAcceptableOrUnknown(data['started_at']!, _startedAtMeta));
+    } else if (isInserting) {
+      context.missing(_startedAtMeta);
+    }
+    if (data.containsKey('ended_at')) {
+      context.handle(_endedAtMeta, endedAt.isAcceptableOrUnknown(data['ended_at']!, _endedAtMeta));
+    } else if (isInserting) {
+      context.missing(_endedAtMeta);
+    }
+    if (data.containsKey('duration_seconds')) {
+      context.handle(
+        _durationSecondsMeta,
+        durationSeconds.isAcceptableOrUnknown(data['duration_seconds']!, _durationSecondsMeta),
+      );
+    } else if (isInserting) {
+      context.missing(_durationSecondsMeta);
+    }
+    if (data.containsKey('complete')) {
+      context.handle(_completeMeta, complete.isAcceptableOrUnknown(data['complete']!, _completeMeta));
+    } else if (isInserting) {
+      context.missing(_completeMeta);
+    }
+    return context;
+  }
+
+  @override
+  Set<GeneratedColumn> get $primaryKey => {id};
+  @override
+  SessionRow map(Map<String, dynamic> data, {String? tablePrefix}) {
+    final effectivePrefix = tablePrefix != null ? '$tablePrefix.' : '';
+    return SessionRow(
+      id: attachedDatabase.typeMapping.read(DriftSqlType.string, data['${effectivePrefix}id'])!,
+      mode: attachedDatabase.typeMapping.read(DriftSqlType.string, data['${effectivePrefix}mode'])!,
+      planId: attachedDatabase.typeMapping.read(DriftSqlType.string, data['${effectivePrefix}plan_id'])!,
+      planName: attachedDatabase.typeMapping.read(DriftSqlType.string, data['${effectivePrefix}plan_name'])!,
+      items: $SessionsTable.$converteritems.fromSql(
+        attachedDatabase.typeMapping.read(DriftSqlType.string, data['${effectivePrefix}items'])!,
+      ),
+      startedAt: attachedDatabase.typeMapping.read(DriftSqlType.dateTime, data['${effectivePrefix}started_at'])!,
+      endedAt: attachedDatabase.typeMapping.read(DriftSqlType.dateTime, data['${effectivePrefix}ended_at'])!,
+      durationSeconds: attachedDatabase.typeMapping.read(DriftSqlType.int, data['${effectivePrefix}duration_seconds'])!,
+      complete: attachedDatabase.typeMapping.read(DriftSqlType.bool, data['${effectivePrefix}complete'])!,
+      setLogs: $SessionsTable.$convertersetLogs.fromSql(
+        attachedDatabase.typeMapping.read(DriftSqlType.string, data['${effectivePrefix}set_logs'])!,
+      ),
+    );
+  }
+
+  @override
+  $SessionsTable createAlias(String alias) {
+    return $SessionsTable(attachedDatabase, alias);
+  }
+
+  static TypeConverter<List<PlanItem>, String> $converteritems = const PlanItemsConverter();
+  static TypeConverter<List<SetLog>, String> $convertersetLogs = const SetLogsConverter();
+}
+
+class SessionRow extends DataClass implements Insertable<SessionRow> {
+  final String id;
+  final String mode;
+
+  /// The Plan it ran, if that still matters; no foreign key, so deleting the Plan keeps its Sessions.
+  final String planId;
+  final String planName;
+  final List<PlanItem> items;
+  final DateTime startedAt;
+  final DateTime endedAt;
+  final int durationSeconds;
+  final bool complete;
+  final List<SetLog> setLogs;
+  const SessionRow({
+    required this.id,
+    required this.mode,
+    required this.planId,
+    required this.planName,
+    required this.items,
+    required this.startedAt,
+    required this.endedAt,
+    required this.durationSeconds,
+    required this.complete,
+    required this.setLogs,
+  });
+  @override
+  Map<String, Expression> toColumns(bool nullToAbsent) {
+    final map = <String, Expression>{};
+    map['id'] = Variable<String>(id);
+    map['mode'] = Variable<String>(mode);
+    map['plan_id'] = Variable<String>(planId);
+    map['plan_name'] = Variable<String>(planName);
+    {
+      map['items'] = Variable<String>($SessionsTable.$converteritems.toSql(items));
+    }
+    map['started_at'] = Variable<DateTime>(startedAt);
+    map['ended_at'] = Variable<DateTime>(endedAt);
+    map['duration_seconds'] = Variable<int>(durationSeconds);
+    map['complete'] = Variable<bool>(complete);
+    {
+      map['set_logs'] = Variable<String>($SessionsTable.$convertersetLogs.toSql(setLogs));
+    }
+    return map;
+  }
+
+  SessionsCompanion toCompanion(bool nullToAbsent) {
+    return SessionsCompanion(
+      id: Value(id),
+      mode: Value(mode),
+      planId: Value(planId),
+      planName: Value(planName),
+      items: Value(items),
+      startedAt: Value(startedAt),
+      endedAt: Value(endedAt),
+      durationSeconds: Value(durationSeconds),
+      complete: Value(complete),
+      setLogs: Value(setLogs),
+    );
+  }
+
+  factory SessionRow.fromJson(Map<String, dynamic> json, {ValueSerializer? serializer}) {
+    serializer ??= driftRuntimeOptions.defaultSerializer;
+    return SessionRow(
+      id: serializer.fromJson<String>(json['id']),
+      mode: serializer.fromJson<String>(json['mode']),
+      planId: serializer.fromJson<String>(json['planId']),
+      planName: serializer.fromJson<String>(json['planName']),
+      items: serializer.fromJson<List<PlanItem>>(json['items']),
+      startedAt: serializer.fromJson<DateTime>(json['startedAt']),
+      endedAt: serializer.fromJson<DateTime>(json['endedAt']),
+      durationSeconds: serializer.fromJson<int>(json['durationSeconds']),
+      complete: serializer.fromJson<bool>(json['complete']),
+      setLogs: serializer.fromJson<List<SetLog>>(json['setLogs']),
+    );
+  }
+  @override
+  Map<String, dynamic> toJson({ValueSerializer? serializer}) {
+    serializer ??= driftRuntimeOptions.defaultSerializer;
+    return <String, dynamic>{
+      'id': serializer.toJson<String>(id),
+      'mode': serializer.toJson<String>(mode),
+      'planId': serializer.toJson<String>(planId),
+      'planName': serializer.toJson<String>(planName),
+      'items': serializer.toJson<List<PlanItem>>(items),
+      'startedAt': serializer.toJson<DateTime>(startedAt),
+      'endedAt': serializer.toJson<DateTime>(endedAt),
+      'durationSeconds': serializer.toJson<int>(durationSeconds),
+      'complete': serializer.toJson<bool>(complete),
+      'setLogs': serializer.toJson<List<SetLog>>(setLogs),
+    };
+  }
+
+  SessionRow copyWith({
+    String? id,
+    String? mode,
+    String? planId,
+    String? planName,
+    List<PlanItem>? items,
+    DateTime? startedAt,
+    DateTime? endedAt,
+    int? durationSeconds,
+    bool? complete,
+    List<SetLog>? setLogs,
+  }) => SessionRow(
+    id: id ?? this.id,
+    mode: mode ?? this.mode,
+    planId: planId ?? this.planId,
+    planName: planName ?? this.planName,
+    items: items ?? this.items,
+    startedAt: startedAt ?? this.startedAt,
+    endedAt: endedAt ?? this.endedAt,
+    durationSeconds: durationSeconds ?? this.durationSeconds,
+    complete: complete ?? this.complete,
+    setLogs: setLogs ?? this.setLogs,
+  );
+  SessionRow copyWithCompanion(SessionsCompanion data) {
+    return SessionRow(
+      id: data.id.present ? data.id.value : this.id,
+      mode: data.mode.present ? data.mode.value : this.mode,
+      planId: data.planId.present ? data.planId.value : this.planId,
+      planName: data.planName.present ? data.planName.value : this.planName,
+      items: data.items.present ? data.items.value : this.items,
+      startedAt: data.startedAt.present ? data.startedAt.value : this.startedAt,
+      endedAt: data.endedAt.present ? data.endedAt.value : this.endedAt,
+      durationSeconds: data.durationSeconds.present ? data.durationSeconds.value : this.durationSeconds,
+      complete: data.complete.present ? data.complete.value : this.complete,
+      setLogs: data.setLogs.present ? data.setLogs.value : this.setLogs,
+    );
+  }
+
+  @override
+  String toString() {
+    return (StringBuffer('SessionRow(')
+          ..write('id: $id, ')
+          ..write('mode: $mode, ')
+          ..write('planId: $planId, ')
+          ..write('planName: $planName, ')
+          ..write('items: $items, ')
+          ..write('startedAt: $startedAt, ')
+          ..write('endedAt: $endedAt, ')
+          ..write('durationSeconds: $durationSeconds, ')
+          ..write('complete: $complete, ')
+          ..write('setLogs: $setLogs')
+          ..write(')'))
+        .toString();
+  }
+
+  @override
+  int get hashCode =>
+      Object.hash(id, mode, planId, planName, items, startedAt, endedAt, durationSeconds, complete, setLogs);
+  @override
+  bool operator ==(Object other) =>
+      identical(this, other) ||
+      (other is SessionRow &&
+          other.id == this.id &&
+          other.mode == this.mode &&
+          other.planId == this.planId &&
+          other.planName == this.planName &&
+          other.items == this.items &&
+          other.startedAt == this.startedAt &&
+          other.endedAt == this.endedAt &&
+          other.durationSeconds == this.durationSeconds &&
+          other.complete == this.complete &&
+          other.setLogs == this.setLogs);
+}
+
+class SessionsCompanion extends UpdateCompanion<SessionRow> {
+  final Value<String> id;
+  final Value<String> mode;
+  final Value<String> planId;
+  final Value<String> planName;
+  final Value<List<PlanItem>> items;
+  final Value<DateTime> startedAt;
+  final Value<DateTime> endedAt;
+  final Value<int> durationSeconds;
+  final Value<bool> complete;
+  final Value<List<SetLog>> setLogs;
+  final Value<int> rowid;
+  const SessionsCompanion({
+    this.id = const Value.absent(),
+    this.mode = const Value.absent(),
+    this.planId = const Value.absent(),
+    this.planName = const Value.absent(),
+    this.items = const Value.absent(),
+    this.startedAt = const Value.absent(),
+    this.endedAt = const Value.absent(),
+    this.durationSeconds = const Value.absent(),
+    this.complete = const Value.absent(),
+    this.setLogs = const Value.absent(),
+    this.rowid = const Value.absent(),
+  });
+  SessionsCompanion.insert({
+    required String id,
+    required String mode,
+    required String planId,
+    required String planName,
+    required List<PlanItem> items,
+    required DateTime startedAt,
+    required DateTime endedAt,
+    required int durationSeconds,
+    required bool complete,
+    required List<SetLog> setLogs,
+    this.rowid = const Value.absent(),
+  }) : id = Value(id),
+       mode = Value(mode),
+       planId = Value(planId),
+       planName = Value(planName),
+       items = Value(items),
+       startedAt = Value(startedAt),
+       endedAt = Value(endedAt),
+       durationSeconds = Value(durationSeconds),
+       complete = Value(complete),
+       setLogs = Value(setLogs);
+  static Insertable<SessionRow> custom({
+    Expression<String>? id,
+    Expression<String>? mode,
+    Expression<String>? planId,
+    Expression<String>? planName,
+    Expression<String>? items,
+    Expression<DateTime>? startedAt,
+    Expression<DateTime>? endedAt,
+    Expression<int>? durationSeconds,
+    Expression<bool>? complete,
+    Expression<String>? setLogs,
+    Expression<int>? rowid,
+  }) {
+    return RawValuesInsertable({
+      if (id != null) 'id': id,
+      if (mode != null) 'mode': mode,
+      if (planId != null) 'plan_id': planId,
+      if (planName != null) 'plan_name': planName,
+      if (items != null) 'items': items,
+      if (startedAt != null) 'started_at': startedAt,
+      if (endedAt != null) 'ended_at': endedAt,
+      if (durationSeconds != null) 'duration_seconds': durationSeconds,
+      if (complete != null) 'complete': complete,
+      if (setLogs != null) 'set_logs': setLogs,
+      if (rowid != null) 'rowid': rowid,
+    });
+  }
+
+  SessionsCompanion copyWith({
+    Value<String>? id,
+    Value<String>? mode,
+    Value<String>? planId,
+    Value<String>? planName,
+    Value<List<PlanItem>>? items,
+    Value<DateTime>? startedAt,
+    Value<DateTime>? endedAt,
+    Value<int>? durationSeconds,
+    Value<bool>? complete,
+    Value<List<SetLog>>? setLogs,
+    Value<int>? rowid,
+  }) {
+    return SessionsCompanion(
+      id: id ?? this.id,
+      mode: mode ?? this.mode,
+      planId: planId ?? this.planId,
+      planName: planName ?? this.planName,
+      items: items ?? this.items,
+      startedAt: startedAt ?? this.startedAt,
+      endedAt: endedAt ?? this.endedAt,
+      durationSeconds: durationSeconds ?? this.durationSeconds,
+      complete: complete ?? this.complete,
+      setLogs: setLogs ?? this.setLogs,
+      rowid: rowid ?? this.rowid,
+    );
+  }
+
+  @override
+  Map<String, Expression> toColumns(bool nullToAbsent) {
+    final map = <String, Expression>{};
+    if (id.present) {
+      map['id'] = Variable<String>(id.value);
+    }
+    if (mode.present) {
+      map['mode'] = Variable<String>(mode.value);
+    }
+    if (planId.present) {
+      map['plan_id'] = Variable<String>(planId.value);
+    }
+    if (planName.present) {
+      map['plan_name'] = Variable<String>(planName.value);
+    }
+    if (items.present) {
+      map['items'] = Variable<String>($SessionsTable.$converteritems.toSql(items.value));
+    }
+    if (startedAt.present) {
+      map['started_at'] = Variable<DateTime>(startedAt.value);
+    }
+    if (endedAt.present) {
+      map['ended_at'] = Variable<DateTime>(endedAt.value);
+    }
+    if (durationSeconds.present) {
+      map['duration_seconds'] = Variable<int>(durationSeconds.value);
+    }
+    if (complete.present) {
+      map['complete'] = Variable<bool>(complete.value);
+    }
+    if (setLogs.present) {
+      map['set_logs'] = Variable<String>($SessionsTable.$convertersetLogs.toSql(setLogs.value));
+    }
+    if (rowid.present) {
+      map['rowid'] = Variable<int>(rowid.value);
+    }
+    return map;
+  }
+
+  @override
+  String toString() {
+    return (StringBuffer('SessionsCompanion(')
+          ..write('id: $id, ')
+          ..write('mode: $mode, ')
+          ..write('planId: $planId, ')
+          ..write('planName: $planName, ')
+          ..write('items: $items, ')
+          ..write('startedAt: $startedAt, ')
+          ..write('endedAt: $endedAt, ')
+          ..write('durationSeconds: $durationSeconds, ')
+          ..write('complete: $complete, ')
+          ..write('setLogs: $setLogs, ')
+          ..write('rowid: $rowid')
+          ..write(')'))
+        .toString();
+  }
+}
+
 abstract class _$AppDatabase extends GeneratedDatabase {
   _$AppDatabase(QueryExecutor e) : super(e);
   $AppDatabaseManager get managers => $AppDatabaseManager(this);
   late final $PlansTable plans = $PlansTable(this);
+  late final $SessionsTable sessions = $SessionsTable(this);
   @override
   Iterable<TableInfo<Table, Object?>> get allTables => allSchemaEntities.whereType<TableInfo<Table, Object?>>();
   @override
-  List<DatabaseSchemaEntity> get allSchemaEntities => [plans];
+  List<DatabaseSchemaEntity> get allSchemaEntities => [plans, sessions];
 }
 
 typedef $$PlansTableCreateCompanionBuilder =
@@ -596,9 +1118,241 @@ typedef $$PlansTableProcessedTableManager =
       PlanRow,
       PrefetchHooks Function()
     >;
+typedef $$SessionsTableCreateCompanionBuilder =
+    SessionsCompanion Function({
+      required String id,
+      required String mode,
+      required String planId,
+      required String planName,
+      required List<PlanItem> items,
+      required DateTime startedAt,
+      required DateTime endedAt,
+      required int durationSeconds,
+      required bool complete,
+      required List<SetLog> setLogs,
+      Value<int> rowid,
+    });
+typedef $$SessionsTableUpdateCompanionBuilder =
+    SessionsCompanion Function({
+      Value<String> id,
+      Value<String> mode,
+      Value<String> planId,
+      Value<String> planName,
+      Value<List<PlanItem>> items,
+      Value<DateTime> startedAt,
+      Value<DateTime> endedAt,
+      Value<int> durationSeconds,
+      Value<bool> complete,
+      Value<List<SetLog>> setLogs,
+      Value<int> rowid,
+    });
+
+class $$SessionsTableFilterComposer extends Composer<_$AppDatabase, $SessionsTable> {
+  $$SessionsTableFilterComposer({
+    required super.$db,
+    required super.$table,
+    super.joinBuilder,
+    super.$addJoinBuilderToRootComposer,
+    super.$removeJoinBuilderFromRootComposer,
+  });
+  ColumnFilters<String> get id => $composableBuilder(column: $table.id, builder: (column) => ColumnFilters(column));
+
+  ColumnFilters<String> get mode => $composableBuilder(column: $table.mode, builder: (column) => ColumnFilters(column));
+
+  ColumnFilters<String> get planId =>
+      $composableBuilder(column: $table.planId, builder: (column) => ColumnFilters(column));
+
+  ColumnFilters<String> get planName =>
+      $composableBuilder(column: $table.planName, builder: (column) => ColumnFilters(column));
+
+  ColumnWithTypeConverterFilters<List<PlanItem>, List<PlanItem>, String> get items =>
+      $composableBuilder(column: $table.items, builder: (column) => ColumnWithTypeConverterFilters(column));
+
+  ColumnFilters<DateTime> get startedAt =>
+      $composableBuilder(column: $table.startedAt, builder: (column) => ColumnFilters(column));
+
+  ColumnFilters<DateTime> get endedAt =>
+      $composableBuilder(column: $table.endedAt, builder: (column) => ColumnFilters(column));
+
+  ColumnFilters<int> get durationSeconds =>
+      $composableBuilder(column: $table.durationSeconds, builder: (column) => ColumnFilters(column));
+
+  ColumnFilters<bool> get complete =>
+      $composableBuilder(column: $table.complete, builder: (column) => ColumnFilters(column));
+
+  ColumnWithTypeConverterFilters<List<SetLog>, List<SetLog>, String> get setLogs =>
+      $composableBuilder(column: $table.setLogs, builder: (column) => ColumnWithTypeConverterFilters(column));
+}
+
+class $$SessionsTableOrderingComposer extends Composer<_$AppDatabase, $SessionsTable> {
+  $$SessionsTableOrderingComposer({
+    required super.$db,
+    required super.$table,
+    super.joinBuilder,
+    super.$addJoinBuilderToRootComposer,
+    super.$removeJoinBuilderFromRootComposer,
+  });
+  ColumnOrderings<String> get id => $composableBuilder(column: $table.id, builder: (column) => ColumnOrderings(column));
+
+  ColumnOrderings<String> get mode =>
+      $composableBuilder(column: $table.mode, builder: (column) => ColumnOrderings(column));
+
+  ColumnOrderings<String> get planId =>
+      $composableBuilder(column: $table.planId, builder: (column) => ColumnOrderings(column));
+
+  ColumnOrderings<String> get planName =>
+      $composableBuilder(column: $table.planName, builder: (column) => ColumnOrderings(column));
+
+  ColumnOrderings<String> get items =>
+      $composableBuilder(column: $table.items, builder: (column) => ColumnOrderings(column));
+
+  ColumnOrderings<DateTime> get startedAt =>
+      $composableBuilder(column: $table.startedAt, builder: (column) => ColumnOrderings(column));
+
+  ColumnOrderings<DateTime> get endedAt =>
+      $composableBuilder(column: $table.endedAt, builder: (column) => ColumnOrderings(column));
+
+  ColumnOrderings<int> get durationSeconds =>
+      $composableBuilder(column: $table.durationSeconds, builder: (column) => ColumnOrderings(column));
+
+  ColumnOrderings<bool> get complete =>
+      $composableBuilder(column: $table.complete, builder: (column) => ColumnOrderings(column));
+
+  ColumnOrderings<String> get setLogs =>
+      $composableBuilder(column: $table.setLogs, builder: (column) => ColumnOrderings(column));
+}
+
+class $$SessionsTableAnnotationComposer extends Composer<_$AppDatabase, $SessionsTable> {
+  $$SessionsTableAnnotationComposer({
+    required super.$db,
+    required super.$table,
+    super.joinBuilder,
+    super.$addJoinBuilderToRootComposer,
+    super.$removeJoinBuilderFromRootComposer,
+  });
+  GeneratedColumn<String> get id => $composableBuilder(column: $table.id, builder: (column) => column);
+
+  GeneratedColumn<String> get mode => $composableBuilder(column: $table.mode, builder: (column) => column);
+
+  GeneratedColumn<String> get planId => $composableBuilder(column: $table.planId, builder: (column) => column);
+
+  GeneratedColumn<String> get planName => $composableBuilder(column: $table.planName, builder: (column) => column);
+
+  GeneratedColumnWithTypeConverter<List<PlanItem>, String> get items =>
+      $composableBuilder(column: $table.items, builder: (column) => column);
+
+  GeneratedColumn<DateTime> get startedAt => $composableBuilder(column: $table.startedAt, builder: (column) => column);
+
+  GeneratedColumn<DateTime> get endedAt => $composableBuilder(column: $table.endedAt, builder: (column) => column);
+
+  GeneratedColumn<int> get durationSeconds =>
+      $composableBuilder(column: $table.durationSeconds, builder: (column) => column);
+
+  GeneratedColumn<bool> get complete => $composableBuilder(column: $table.complete, builder: (column) => column);
+
+  GeneratedColumnWithTypeConverter<List<SetLog>, String> get setLogs =>
+      $composableBuilder(column: $table.setLogs, builder: (column) => column);
+}
+
+class $$SessionsTableTableManager
+    extends
+        RootTableManager<
+          _$AppDatabase,
+          $SessionsTable,
+          SessionRow,
+          $$SessionsTableFilterComposer,
+          $$SessionsTableOrderingComposer,
+          $$SessionsTableAnnotationComposer,
+          $$SessionsTableCreateCompanionBuilder,
+          $$SessionsTableUpdateCompanionBuilder,
+          (SessionRow, BaseReferences<_$AppDatabase, $SessionsTable, SessionRow>),
+          SessionRow,
+          PrefetchHooks Function()
+        > {
+  $$SessionsTableTableManager(_$AppDatabase db, $SessionsTable table)
+    : super(
+        TableManagerState(
+          db: db,
+          table: table,
+          createFilteringComposer: () => $$SessionsTableFilterComposer($db: db, $table: table),
+          createOrderingComposer: () => $$SessionsTableOrderingComposer($db: db, $table: table),
+          createComputedFieldComposer: () => $$SessionsTableAnnotationComposer($db: db, $table: table),
+          updateCompanionCallback:
+              ({
+                Value<String> id = const Value.absent(),
+                Value<String> mode = const Value.absent(),
+                Value<String> planId = const Value.absent(),
+                Value<String> planName = const Value.absent(),
+                Value<List<PlanItem>> items = const Value.absent(),
+                Value<DateTime> startedAt = const Value.absent(),
+                Value<DateTime> endedAt = const Value.absent(),
+                Value<int> durationSeconds = const Value.absent(),
+                Value<bool> complete = const Value.absent(),
+                Value<List<SetLog>> setLogs = const Value.absent(),
+                Value<int> rowid = const Value.absent(),
+              }) => SessionsCompanion(
+                id: id,
+                mode: mode,
+                planId: planId,
+                planName: planName,
+                items: items,
+                startedAt: startedAt,
+                endedAt: endedAt,
+                durationSeconds: durationSeconds,
+                complete: complete,
+                setLogs: setLogs,
+                rowid: rowid,
+              ),
+          createCompanionCallback:
+              ({
+                required String id,
+                required String mode,
+                required String planId,
+                required String planName,
+                required List<PlanItem> items,
+                required DateTime startedAt,
+                required DateTime endedAt,
+                required int durationSeconds,
+                required bool complete,
+                required List<SetLog> setLogs,
+                Value<int> rowid = const Value.absent(),
+              }) => SessionsCompanion.insert(
+                id: id,
+                mode: mode,
+                planId: planId,
+                planName: planName,
+                items: items,
+                startedAt: startedAt,
+                endedAt: endedAt,
+                durationSeconds: durationSeconds,
+                complete: complete,
+                setLogs: setLogs,
+                rowid: rowid,
+              ),
+          withReferenceMapper: (p0) => p0.map((e) => (e.readTable(table), BaseReferences(db, table, e))).toList(),
+          prefetchHooksCallback: null,
+        ),
+      );
+}
+
+typedef $$SessionsTableProcessedTableManager =
+    ProcessedTableManager<
+      _$AppDatabase,
+      $SessionsTable,
+      SessionRow,
+      $$SessionsTableFilterComposer,
+      $$SessionsTableOrderingComposer,
+      $$SessionsTableAnnotationComposer,
+      $$SessionsTableCreateCompanionBuilder,
+      $$SessionsTableUpdateCompanionBuilder,
+      (SessionRow, BaseReferences<_$AppDatabase, $SessionsTable, SessionRow>),
+      SessionRow,
+      PrefetchHooks Function()
+    >;
 
 class $AppDatabaseManager {
   final _$AppDatabase _db;
   $AppDatabaseManager(this._db);
   $$PlansTableTableManager get plans => $$PlansTableTableManager(_db, _db.plans);
+  $$SessionsTableTableManager get sessions => $$SessionsTableTableManager(_db, _db.sessions);
 }

lib/src/design/app_theme.dart

@@ -1,4 +1,5 @@
 import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
 
 import '../modes/mode.dart';
 import 'zen_style.dart';
@@ -53,6 +54,7 @@ class AppTheme {
         labelLarge: text.labelLarge?.copyWith(fontWeight: FontWeight.w700),
       ),
       appBarTheme: AppBarTheme(
+        systemOverlayStyle: workout ? SystemUiOverlayStyle.light : SystemUiOverlayStyle.dark,
         backgroundColor: s.background,
         surfaceTintColor: Colors.transparent,
         foregroundColor: s.ink,

lib/src/history/session_repository.dart

@@ -0,0 +1,86 @@
+import 'package:drift/drift.dart';
+import 'package:uuid/uuid.dart';
+
+import '../database/database.dart';
+import '../modes/mode.dart';
+import '../plans/models/plan.dart';
+import '../player/session_runner.dart';
+
+/// A Session as History shows it.
+class Session {
+  const Session({
+    required this.id,
+    required this.mode,
+    required this.planId,
+    required this.planName,
+    required this.items,
+    required this.startedAt,
+    required this.endedAt,
+    required this.duration,
+    required this.complete,
+    required this.setLogs,
+  });
+
+  final String id;
+  final Mode mode;
+  final String planId;
+  final String planName;
+
+  /// The Plan's Steps and Supersets as they were when the Session ran.
+  final List<PlanItem> items;
+  final DateTime startedAt;
+  final DateTime endedAt;
+  final Duration duration;
+  final bool complete;
+  final List<SetLog> setLogs;
+}
+
+/// Finished Sessions, per Mode.
+class SessionRepository {
+  SessionRepository(this._db);
+
+  final AppDatabase _db;
+
+  Future<Session> save(SessionResult result) async {
+    final row = SessionsCompanion.insert(
+      id: const Uuid().v4(),
+      mode: result.plan.mode.name,
+      planId: result.plan.id,
+      planName: result.plan.name,
+      items: result.plan.items,
+      startedAt: result.startedAt,
+      endedAt: result.endedAt,
+      durationSeconds: result.duration.inSeconds,
+      complete: result.complete,
+      setLogs: result.setLogs,
+    );
+    await _db.into(_db.sessions).insert(row);
+    return (await get(row.id.value))!;
+  }
+
+  Future<Session?> get(String id) async {
+    final row = await (_db.select(_db.sessions)..where((s) => s.id.equals(id))).getSingleOrNull();
+    return row == null ? null : _toSession(row);
+  }
+
+  /// A Mode's Sessions, the latest first.
+  Stream<List<Session>> watchSessions(Mode mode) {
+    final query = _db.select(_db.sessions)
+      ..where((s) => s.mode.equals(mode.name))
+      ..orderBy([(s) => OrderingTerm.desc(s.endedAt)]);
+    return query.watch().map((rows) => rows.map(_toSession).toList());
+  }
+
+  static Session _toSession(SessionRow row) => Session(
+    id: row.id,
+    mode: Mode.fromName(row.mode),
+    planId: row.planId,
+    planName: row.planName,
+    items: row.items,
+    startedAt: row.startedAt,
+    endedAt: row.endedAt,
+    duration: Duration(seconds: row.durationSeconds),
+    complete: row.complete,
+    setLogs: row.setLogs,
+  );
+}

lib/src/localization/app_en.arb

@@ -237,5 +237,95 @@
     }
   },
   "addToPlan": "Add to plan",
-  "addToPlanTitle": "Add to which plan?"
+  "addToPlanTitle": "Add to which plan?",
+  "start": "Start",
+  "startPlan": "Start",
+  "playerClose": "End session",
+  "mute": "Mute sounds",
+  "unmute": "Turn sounds on",
+  "pause": "Pause",
+  "resume": "Resume",
+  "skip": "Skip",
+  "previous": "Previous",
+  "paused": "Paused",
+  "progress": "{done} of {total}",
+  "@progress": {
+    "placeholders": {
+      "done": {
+        "type": "int"
+      },
+      "total": {
+        "type": "int"
+      }
+    }
+  },
+  "transitionGetReady": "Get ready",
+  "transitionSwitchSides": "Switch sides",
+  "transitionNextRound": "Round {round}",
+  "@transitionNextRound": {
+    "placeholders": {
+      "round": {
+        "type": "int"
+      }
+    }
+  },
+  "transitionNextExercise": "Next up",
+  "sideLeft": "Left side",
+  "sideRight": "Right side",
+  "roundOf": "Round {round} of {rounds}",
+  "@roundOf": {
+    "placeholders": {
+      "round": {
+        "type": "int"
+      },
+      "rounds": {
+        "type": "int"
+      }
+    }
+  },
+  "setOf": "Set {set} of {sets}",
+  "@setOf": {
+    "placeholders": {
+      "set": {
+        "type": "int"
+      },
+      "sets": {
+        "type": "int"
+      }
+    }
+  },
+  "setDone": "Set done",
+  "doneEarly": "Done early",
+  "saveSet": "Save set",
+  "logSetTitle": "How did it go?",
+  "restTitle": "Rest",
+  "restNext": "Next",
+  "startNextSet": "Start next set",
+  "endSessionTitle": "End this session?",
+  "endSessionBody": "What you did so far is saved as unfinished. Only finished sessions count toward your streak.",
+  "keepGoing": "Keep going",
+  "endSession": "End session",
+  "summaryComplete": "Session complete",
+  "summaryIncomplete": "Ended early",
+  "summaryDuration": "Time",
+  "summaryExercises": "Exercises",
+  "summarySets": "Sets logged",
+  "summaryLogTitle": "What you did",
+  "setLogLine": "Set {set}",
+  "@setLogLine": {
+    "placeholders": {
+      "set": {
+        "type": "int"
+      }
+    }
+  },
+  "durationMinutes": "{minutes, plural, =0{under a minute} =1{1 min} other{{minutes} min}}",
+  "@durationMinutes": {
+    "placeholders": {
+      "minutes": {
+        "type": "int"
+      }
+    }
+  },
+  "logWeight": "Add a weight"
 }

lib/src/localization/app_localizations.dart

@@ -61,8 +61,7 @@ import 'app_localizations_en.dart';
 /// be consistent with the languages listed in the AppLocalizations.supportedLocales
 /// property.
 abstract class AppLocalizations {
-  AppLocalizations(String locale)
+  AppLocalizations(String locale) : localeName = intl.Intl.canonicalizedLocale(locale.toString());
-    : localeName = intl.Intl.canonicalizedLocale(locale.toString());
 
   final String localeName;
 
@@ -70,8 +69,7 @@ abstract class AppLocalizations {
     return Localizations.of<AppLocalizations>(context, AppLocalizations)!;
   }
 
-  static const LocalizationsDelegate<AppLocalizations> delegate =
+  static const LocalizationsDelegate<AppLocalizations> delegate = _AppLocalizationsDelegate();
-      _AppLocalizationsDelegate();
 
   /// A list of this localizations delegate along with the default localizations
   /// delegates.
@@ -83,13 +81,12 @@ abstract class AppLocalizations {
   /// Additional delegates can be added by appending to this list in
   /// MaterialApp. This list does not have to be used at all if a custom list
   /// of delegates is preferred or required.
-  static const List<LocalizationsDelegate<dynamic>> localizationsDelegates =
+  static const List<LocalizationsDelegate<dynamic>> localizationsDelegates = <LocalizationsDelegate<dynamic>>[
-      <LocalizationsDelegate<dynamic>>[
+    delegate,
-        delegate,
+    GlobalMaterialLocalizations.delegate,
-        GlobalMaterialLocalizations.delegate,
+    GlobalCupertinoLocalizations.delegate,
-        GlobalCupertinoLocalizations.delegate,
+    GlobalWidgetsLocalizations.delegate,
-        GlobalWidgetsLocalizations.delegate,
+  ];
-      ];
 
   /// A list of this localizations delegate's supported locales.
   static const List<Locale> supportedLocales = <Locale>[Locale('en')];
@@ -609,10 +606,243 @@ abstract class AppLocalizations {
   /// In en, this message translates to:
   /// **'Add to which plan?'**
   String get addToPlanTitle;
+
+  /// No description provided for @start.
+  ///
+  /// In en, this message translates to:
+  /// **'Start'**
+  String get start;
+
+  /// No description provided for @startPlan.
+  ///
+  /// In en, this message translates to:
+  /// **'Start'**
+  String get startPlan;
+
+  /// No description provided for @playerClose.
+  ///
+  /// In en, this message translates to:
+  /// **'End session'**
+  String get playerClose;
+
+  /// No description provided for @mute.
+  ///
+  /// In en, this message translates to:
+  /// **'Mute sounds'**
+  String get mute;
+
+  /// No description provided for @unmute.
+  ///
+  /// In en, this message translates to:
+  /// **'Turn sounds on'**
+  String get unmute;
+
+  /// No description provided for @pause.
+  ///
+  /// In en, this message translates to:
+  /// **'Pause'**
+  String get pause;
+
+  /// No description provided for @resume.
+  ///
+  /// In en, this message translates to:
+  /// **'Resume'**
+  String get resume;
+
+  /// No description provided for @skip.
+  ///
+  /// In en, this message translates to:
+  /// **'Skip'**
+  String get skip;
+
+  /// No description provided for @previous.
+  ///
+  /// In en, this message translates to:
+  /// **'Previous'**
+  String get previous;
+
+  /// No description provided for @paused.
+  ///
+  /// In en, this message translates to:
+  /// **'Paused'**
+  String get paused;
+
+  /// No description provided for @progress.
+  ///
+  /// In en, this message translates to:
+  /// **'{done} of {total}'**
+  String progress(int done, int total);
+
+  /// No description provided for @transitionGetReady.
+  ///
+  /// In en, this message translates to:
+  /// **'Get ready'**
+  String get transitionGetReady;
+
+  /// No description provided for @transitionSwitchSides.
+  ///
+  /// In en, this message translates to:
+  /// **'Switch sides'**
+  String get transitionSwitchSides;
+
+  /// No description provided for @transitionNextRound.
+  ///
+  /// In en, this message translates to:
+  /// **'Round {round}'**
+  String transitionNextRound(int round);
+
+  /// No description provided for @transitionNextExercise.
+  ///
+  /// In en, this message translates to:
+  /// **'Next up'**
+  String get transitionNextExercise;
+
+  /// No description provided for @sideLeft.
+  ///
+  /// In en, this message translates to:
+  /// **'Left side'**
+  String get sideLeft;
+
+  /// No description provided for @sideRight.
+  ///
+  /// In en, this message translates to:
+  /// **'Right side'**
+  String get sideRight;
+
+  /// No description provided for @roundOf.
+  ///
+  /// In en, this message translates to:
+  /// **'Round {round} of {rounds}'**
+  String roundOf(int round, int rounds);
+
+  /// No description provided for @setOf.
+  ///
+  /// In en, this message translates to:
+  /// **'Set {set} of {sets}'**
+  String setOf(int set, int sets);
+
+  /// No description provided for @setDone.
+  ///
+  /// In en, this message translates to:
+  /// **'Set done'**
+  String get setDone;
+
+  /// No description provided for @doneEarly.
+  ///
+  /// In en, this message translates to:
+  /// **'Done early'**
+  String get doneEarly;
+
+  /// No description provided for @saveSet.
+  ///
+  /// In en, this message translates to:
+  /// **'Save set'**
+  String get saveSet;
+
+  /// No description provided for @logSetTitle.
+  ///
+  /// In en, this message translates to:
+  /// **'How did it go?'**
+  String get logSetTitle;
+
+  /// No description provided for @restTitle.
+  ///
+  /// In en, this message translates to:
+  /// **'Rest'**
+  String get restTitle;
+
+  /// No description provided for @restNext.
+  ///
+  /// In en, this message translates to:
+  /// **'Next'**
+  String get restNext;
+
+  /// No description provided for @startNextSet.
+  ///
+  /// In en, this message translates to:
+  /// **'Start next set'**
+  String get startNextSet;
+
+  /// No description provided for @endSessionTitle.
+  ///
+  /// In en, this message translates to:
+  /// **'End this session?'**
+  String get endSessionTitle;
+
+  /// No description provided for @endSessionBody.
+  ///
+  /// In en, this message translates to:
+  /// **'What you did so far is saved as unfinished. Only finished sessions count toward your streak.'**
+  String get endSessionBody;
+
+  /// No description provided for @keepGoing.
+  ///
+  /// In en, this message translates to:
+  /// **'Keep going'**
+  String get keepGoing;
+
+  /// No description provided for @endSession.
+  ///
+  /// In en, this message translates to:
+  /// **'End session'**
+  String get endSession;
+
+  /// No description provided for @summaryComplete.
+  ///
+  /// In en, this message translates to:
+  /// **'Session complete'**
+  String get summaryComplete;
+
+  /// No description provided for @summaryIncomplete.
+  ///
+  /// In en, this message translates to:
+  /// **'Ended early'**
+  String get summaryIncomplete;
+
+  /// No description provided for @summaryDuration.
+  ///
+  /// In en, this message translates to:
+  /// **'Time'**
+  String get summaryDuration;
+
+  /// No description provided for @summaryExercises.
+  ///
+  /// In en, this message translates to:
+  /// **'Exercises'**
+  String get summaryExercises;
+
+  /// No description provided for @summarySets.
+  ///
+  /// In en, this message translates to:
+  /// **'Sets logged'**
+  String get summarySets;
+
+  /// No description provided for @summaryLogTitle.
+  ///
+  /// In en, this message translates to:
+  /// **'What you did'**
+  String get summaryLogTitle;
+
+  /// No description provided for @setLogLine.
+  ///
+  /// In en, this message translates to:
+  /// **'Set {set}'**
+  String setLogLine(int set);
+
+  /// No description provided for @durationMinutes.
+  ///
+  /// In en, this message translates to:
+  /// **'{minutes, plural, =0{under a minute} =1{1 min} other{{minutes} min}}'**
+  String durationMinutes(int minutes);
+
+  /// No description provided for @logWeight.
+  ///
+  /// In en, this message translates to:
+  /// **'Add a weight'**
+  String get logWeight;
 }
 
-class _AppLocalizationsDelegate
+class _AppLocalizationsDelegate extends LocalizationsDelegate<AppLocalizations> {
-    extends LocalizationsDelegate<AppLocalizations> {
   const _AppLocalizationsDelegate();
 
   @override
@@ -621,8 +851,7 @@ class _AppLocalizationsDelegate
   }
 
   @override
-  bool isSupported(Locale locale) =>
+  bool isSupported(Locale locale) => <String>['en'].contains(locale.languageCode);
-      <String>['en'].contains(locale.languageCode);
 
   @override
   bool shouldReload(_AppLocalizationsDelegate old) => false;

lib/src/localization/app_localizations_en.dart

@@ -38,10 +38,8 @@ class AppLocalizationsEn extends AppLocalizations {
   @override
   String plansEmptyBody(String mode) {
     String _temp0 = intl.Intl.selectLogic(mode, {
-      'stretching':
+      'stretching': 'Put together a stretch routine from the library and it will wait for you here.',
-          'Put together a stretch routine from the library and it will wait for you here.',
+      'other': 'Put together a workout from the library and it will wait for you here.',
-      'other':
-          'Put together a workout from the library and it will wait for you here.',
     });
     return '$_temp0';
   }
@@ -51,22 +49,9 @@ class AppLocalizationsEn extends AppLocalizations {
 
   @override
   String librarySubtitle(String mode, int count) {
-    String _temp0 = intl.Intl.pluralLogic(
+    String _temp0 = intl.Intl.pluralLogic(count, locale: localeName, other: '$count stretches', one: '1 stretch');
-      count,
+    String _temp1 = intl.Intl.pluralLogic(count, locale: localeName, other: '$count exercises', one: '1 exercise');
-      locale: localeName,
+    String _temp2 = intl.Intl.selectLogic(mode, {'stretching': '$_temp0', 'other': '$_temp1'});
-      other: '$count stretches',
-      one: '1 stretch',
-    );
-    String _temp1 = intl.Intl.pluralLogic(
-      count,
-      locale: localeName,
-      other: '$count exercises',
-      one: '1 exercise',
-    );
-    String _temp2 = intl.Intl.selectLogic(mode, {
-      'stretching': '$_temp0',
-      'other': '$_temp1',
-    });
     return '$_temp2';
   }
 
@@ -77,8 +62,7 @@ class AppLocalizationsEn extends AppLocalizations {
   String get historyEmptyTitle => 'Nothing logged yet';
 
   @override
-  String get historyEmptyBody =>
+  String get historyEmptyBody => 'Finished sessions show up here with their date and duration.';
-      'Finished sessions show up here with their date and duration.';
 
   @override
   String librarySubtitleFiltered(String mode, int shown, int total) {
@@ -91,10 +75,7 @@ class AppLocalizationsEn extends AppLocalizations {
 
   @override
   String searchHint(String mode) {
-    String _temp0 = intl.Intl.selectLogic(mode, {
+    String _temp0 = intl.Intl.selectLogic(mode, {'stretching': 'Search stretches', 'other': 'Search exercises'});
-      'stretching': 'Search stretches',
-      'other': 'Search exercises',
-    });
     return '$_temp0';
   }
 
@@ -129,8 +110,7 @@ class AppLocalizationsEn extends AppLocalizations {
   String get noMatchesTitle => 'No matches';
 
   @override
-  String get noMatchesBody =>
+  String get noMatchesBody => 'Try fewer words, or clear the filters to see everything again.';
-      'Try fewer words, or clear the filters to see everything again.';
 
   @override
   String get detailMainMuscles => 'Main muscles';
@@ -167,10 +147,7 @@ class AppLocalizationsEn extends AppLocalizations {
 
   @override
   String planNameHint(String mode) {
-    String _temp0 = intl.Intl.selectLogic(mode, {
+    String _temp0 = intl.Intl.selectLogic(mode, {'stretching': 'e.g. Morning stretch', 'other': 'e.g. Push day'});
-      'stretching': 'e.g. Morning stretch',
-      'other': 'e.g. Push day',
-    });
     return '$_temp0';
   }
 
@@ -218,8 +195,7 @@ class AppLocalizationsEn extends AppLocalizations {
   }
 
   @override
-  String get deletePlanBody =>
+  String get deletePlanBody => 'The plan is removed. Sessions you already finished stay in your history.';
-      'The plan is removed. Sessions you already finished stay in your history.';
 
   @override
   String planExerciseCount(int count) {
@@ -269,12 +245,7 @@ class AppLocalizationsEn extends AppLocalizations {
 
   @override
   String repsCount(int count) {
-    String _temp0 = intl.Intl.pluralLogic(
+    String _temp0 = intl.Intl.pluralLogic(count, locale: localeName, other: '$count reps', one: '1 rep');
-      count,
-      locale: localeName,
-      other: '$count reps',
-      one: '1 rep',
-    );
     return '$_temp0';
   }
 
@@ -298,23 +269,13 @@ class AppLocalizationsEn extends AppLocalizations {
 
   @override
   String roundsCount(int count) {
-    String _temp0 = intl.Intl.pluralLogic(
+    String _temp0 = intl.Intl.pluralLogic(count, locale: localeName, other: '$count rounds', one: '1 round');
-      count,
-      locale: localeName,
-      other: '$count rounds',
-      one: '1 round',
-    );
     return '$_temp0';
   }
 
   @override
   String setsCount(int count) {
-    String _temp0 = intl.Intl.pluralLogic(
+    String _temp0 = intl.Intl.pluralLogic(count, locale: localeName, other: '$count sets', one: '1 set');
-      count,
-      locale: localeName,
-      other: '$count sets',
-      one: '1 set',
-    );
     return '$_temp0';
   }
 
@@ -355,8 +316,7 @@ class AppLocalizationsEn extends AppLocalizations {
   String get restBetweenLabel => 'Rest between exercises';
 
   @override
-  String get restBetweenHint =>
+  String get restBetweenHint => 'When off, you go straight to the next exercise and rest after each round.';
-      'When off, you go straight to the next exercise and rest after each round.';
 
   @override
   String get supersetWithNext => 'Superset with next';
@@ -385,4 +345,141 @@ class AppLocalizationsEn extends AppLocalizations {
 
   @override
   String get addToPlanTitle => 'Add to which plan?';
+
+  @override
+  String get start => 'Start';
+
+  @override
+  String get startPlan => 'Start';
+
+  @override
+  String get playerClose => 'End session';
+
+  @override
+  String get mute => 'Mute sounds';
+
+  @override
+  String get unmute => 'Turn sounds on';
+
+  @override
+  String get pause => 'Pause';
+
+  @override
+  String get resume => 'Resume';
+
+  @override
+  String get skip => 'Skip';
+
+  @override
+  String get previous => 'Previous';
+
+  @override
+  String get paused => 'Paused';
+
+  @override
+  String progress(int done, int total) {
+    return '$done of $total';
+  }
+
+  @override
+  String get transitionGetReady => 'Get ready';
+
+  @override
+  String get transitionSwitchSides => 'Switch sides';
+
+  @override
+  String transitionNextRound(int round) {
+    return 'Round $round';
+  }
+
+  @override
+  String get transitionNextExercise => 'Next up';
+
+  @override
+  String get sideLeft => 'Left side';
+
+  @override
+  String get sideRight => 'Right side';
+
+  @override
+  String roundOf(int round, int rounds) {
+    return 'Round $round of $rounds';
+  }
+
+  @override
+  String setOf(int set, int sets) {
+    return 'Set $set of $sets';
+  }
+
+  @override
+  String get setDone => 'Set done';
+
+  @override
+  String get doneEarly => 'Done early';
+
+  @override
+  String get saveSet => 'Save set';
+
+  @override
+  String get logSetTitle => 'How did it go?';
+
+  @override
+  String get restTitle => 'Rest';
+
+  @override
+  String get restNext => 'Next';
+
+  @override
+  String get startNextSet => 'Start next set';
+
+  @override
+  String get endSessionTitle => 'End this session?';
+
+  @override
+  String get endSessionBody =>
+      'What you did so far is saved as unfinished. Only finished sessions count toward your streak.';
+
+  @override
+  String get keepGoing => 'Keep going';
+
+  @override
+  String get endSession => 'End session';
+
+  @override
+  String get summaryComplete => 'Session complete';
+
+  @override
+  String get summaryIncomplete => 'Ended early';
+
+  @override
+  String get summaryDuration => 'Time';
+
+  @override
+  String get summaryExercises => 'Exercises';
+
+  @override
+  String get summarySets => 'Sets logged';
+
+  @override
+  String get summaryLogTitle => 'What you did';
+
+  @override
+  String setLogLine(int set) {
+    return 'Set $set';
+  }
+
+  @override
+  String durationMinutes(int minutes) {
+    String _temp0 = intl.Intl.pluralLogic(
+      minutes,
+      locale: localeName,
+      other: '$minutes min',
+      one: '1 min',
+      zero: 'under a minute',
+    );
+    return '$_temp0';
+  }
+
+  @override
+  String get logWeight => 'Add a weight';
 }

lib/src/plans/views/plan_editor_view.dart

@@ -11,6 +11,7 @@ import '../../modes/mode.dart';
 import '../models/plan.dart';
 import '../plan_labels.dart';
 import '../plan_repository.dart';
+import '../../player/views/player_view.dart';
 import 'exercise_picker_view.dart';
 import 'plans_view.dart';
 import 'step_editor_sheet.dart';
@@ -50,7 +51,6 @@ class _Editor extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     final l10n = AppLocalizations.of(context);
-    final bottomInset = MediaQuery.paddingOf(context).bottom;
     final addButton = FilledButton.icon(
       onPressed: () => _addExercises(context),
       icon: const Icon(Icons.add_rounded),
@@ -78,7 +78,7 @@ class _Editor extends StatelessWidget {
             )
           : ReorderableListView.builder(
               buildDefaultDragHandles: false,
-              padding: EdgeInsets.only(bottom: 96 + bottomInset),
+              padding: const EdgeInsets.only(bottom: 24),
               header: Column(
                 crossAxisAlignment: CrossAxisAlignment.stretch,
                 children: [
@@ -111,12 +111,35 @@ class _Editor extends StatelessWidget {
                 },
               ),
             ),
-      floatingActionButton: plan.items.isEmpty
+      bottomNavigationBar: plan.items.isEmpty
           ? null
-          : FloatingActionButton.extended(
+          : SafeArea(
-              onPressed: () => _addExercises(context),
+              child: Padding(
-              icon: const Icon(Icons.add_rounded),
+                padding: const EdgeInsets.fromLTRB(16, 8, 16, 12),
-              label: Text(l10n.addExercises),
+                child: Row(
+                  children: [
+                    SizedBox(
+                      height: 52,
+                      child: OutlinedButton.icon(
+                        onPressed: () => _addExercises(context),
+                        icon: const Icon(Icons.add_rounded),
+                        label: Text(l10n.addExercises),
+                      ),
+                    ),
+                    const SizedBox(width: 12),
+                    Expanded(
+                      child: SizedBox(
+                        height: 52,
+                        child: FilledButton.icon(
+                          onPressed: () => startPlan(context, plan),
+                          icon: const Icon(Icons.play_arrow_rounded),
+                          label: Text(l10n.startPlan),
+                        ),
+                      ),
+                    ),
+                  ],
+                ),
+              ),
             ),
     );
   }

lib/src/plans/views/plans_view.dart

@@ -10,6 +10,7 @@ import '../../settings/settings_controller.dart';
 import '../models/plan.dart';
 import '../plan_labels.dart';
 import '../plan_repository.dart';
+import '../../player/views/player_view.dart';
 import 'plan_dialogs.dart';
 import 'plan_editor_view.dart';
 
@@ -98,6 +99,12 @@ class PlanCard extends StatelessWidget {
                   ],
                 ),
               ),
+              if (plan.items.isNotEmpty)
+                IconButton.filled(
+                  tooltip: l10n.startPlan,
+                  onPressed: () => startPlan(context, plan),
+                  icon: const Icon(Icons.play_arrow_rounded),
+                ),
               PlanMenu(plan: plan),
             ],
           ),

lib/src/player/player_effects.dart

@@ -0,0 +1,36 @@
+import 'package:audioplayers/audioplayers.dart';
+import 'package:wakelock_plus/wakelock_plus.dart';
+
+import '../modes/mode.dart';
+
+/// What the Player does to the device: the Mode's chime and keeping the
+/// screen on. Tests swap in a silent version.
+abstract interface class PlayerEffects {
+  Future<void> chime(Mode mode);
+
+  Future<void> keepScreenOn(bool on);
+}
+
+class DevicePlayerEffects implements PlayerEffects {
+  DevicePlayerEffects() {
+    // No audio focus: the chime plays over the user's music instead of pausing it.
+    _player.setAudioContext(
+      AudioContext(
+        android: const AudioContextAndroid(
+          audioFocus: AndroidAudioFocus.none,
+          usageType: AndroidUsageType.assistanceSonification,
+          contentType: AndroidContentType.sonification,
+        ),
+      ),
+    );
+    _player.setReleaseMode(ReleaseMode.stop);
+  }
+
+  final _player = AudioPlayer();
+
+  @override
+  Future<void> chime(Mode mode) => _player.play(AssetSource('sounds/${mode.name}_cue.wav'));
+
+  @override
+  Future<void> keepScreenOn(bool on) => WakelockPlus.toggle(enable: on);
+}

lib/src/player/segments.dart

@@ -0,0 +1,151 @@
+import '../modes/mode.dart';
+import '../plans/models/plan.dart';
+
+/// One screen of the Player, in the order a Session runs through them.
+sealed class Segment {
+  const Segment();
+
+  /// The Exercise this segment is about, or null for Transitions and Rests.
+  String? get exerciseId => null;
+}
+
+enum Side { left, right }
+
+/// A Stretching hold, counting down and moving on by itself.
+class HoldSegment extends Segment {
+  const HoldSegment({
+    required this.exerciseId,
+    required this.seconds,
+    required this.side,
+    required this.round,
+    required this.rounds,
+  });
+
+  @override
+  final String exerciseId;
+  final int seconds;
+
+  /// Null when the Step is not held on both sides.
+  final Side? side;
+  final int round;
+  final int rounds;
+}
+
+enum TransitionKind { getReady, switchSides, nextRound, nextExercise }
+
+/// A short Stretching card between holds; the next hold starts when it ends.
+class TransitionSegment extends Segment {
+  const TransitionSegment({required this.kind, required this.seconds});
+
+  final TransitionKind kind;
+  final int seconds;
+}
+
+/// One Workout set. A rep set ends with "Set done"; a timed set counts down
+/// once started.
+class SetSegment extends Segment {
+  const SetSegment({
+    required this.exerciseId,
+    required this.target,
+    required this.weightKg,
+    required this.set,
+    required this.sets,
+  });
+
+  @override
+  final String exerciseId;
+  final WorkoutTarget target;
+  final double? weightKg;
+
+  /// This set's number and the total, counted per Step or Superset round.
+  final int set;
+  final int sets;
+}
+
+/// The Workout Rest Screen: counts up until the user starts the next set.
+class RestSegment extends Segment {
+  const RestSegment();
+}
+
+/// Lays a Plan out as the Player will run it.
+List<Segment> buildSegments(Plan plan) => switch (plan.mode) {
+  Mode.stretching => _stretching(plan),
+  Mode.workout => _workout(plan),
+};
+
+List<Segment> _stretching(Plan plan) {
+  final segments = <Segment>[];
+  final pause = plan.transitionSeconds;
+  void transition(TransitionKind kind) {
+    if (pause > 0) segments.add(TransitionSegment(kind: kind, seconds: pause));
+  }
+
+  for (final (i, step) in plan.items.whereType<StretchingStep>().indexed) {
+    for (var round = 1; round <= step.rounds; round++) {
+      final sides = step.bothSides ? Side.values : const [null];
+      for (final (s, side) in sides.indexed) {
+        transition(switch ((i, round, s)) {
+          (0, 1, 0) => TransitionKind.getReady,
+          (_, 1, 0) => TransitionKind.nextExercise,
+          (_, _, 0) => TransitionKind.nextRound,
+          _ => TransitionKind.switchSides,
+        });
+        segments.add(
+          HoldSegment(
+            exerciseId: step.exerciseId,
+            seconds: step.holdSeconds,
+            side: side,
+            round: round,
+            rounds: step.rounds,
+          ),
+        );
+      }
+    }
+  }
+  return segments;
+}
+
+List<Segment> _workout(Plan plan) {
+  final segments = <Segment>[];
+  // A Rest goes before every set but the first; within a Superset round only if it asks for one.
+  void add(SetSegment set, {required bool restBefore}) {
+    if (segments.isNotEmpty && restBefore) segments.add(const RestSegment());
+    segments.add(set);
+  }
+
+  for (final item in plan.items) {
+    switch (item) {
+      case WorkoutStep():
+        for (var set = 1; set <= item.sets; set++) {
+          add(
+            SetSegment(
+              exerciseId: item.exerciseId,
+              target: item.target,
+              weightKg: item.weightKg,
+              set: set,
+              sets: item.sets,
+            ),
+            restBefore: true,
+          );
+        }
+      case Superset():
+        for (var round = 1; round <= item.sets; round++) {
+          for (final (m, member) in item.members.indexed) {
+            add(
+              SetSegment(
+                exerciseId: member.exerciseId,
+                target: member.target,
+                weightKg: member.weightKg,
+                set: round,
+                sets: item.sets,
+              ),
+              restBefore: m == 0 || item.restBetween,
+            );
+          }
+        }
+      case StretchingStep():
+        break;
+    }
+  }
+  return segments;
+}

lib/src/player/session_runner.dart

@@ -0,0 +1,241 @@
+import 'package:flutter/foundation.dart';
+
+import '../plans/models/plan.dart';
+import 'segments.dart';
+
+/// The reps or time and weight actually done for one Workout set.
+@immutable
+class SetLog {
+  const SetLog({required this.exerciseId, required this.set, this.reps, this.seconds, this.weightKg});
+
+  final String exerciseId;
+  final int set;
+  final int? reps;
+  final int? seconds;
+  final double? weightKg;
+
+  Map<String, Object?> toJson() => {
+    'exerciseId': exerciseId,
+    'set': set,
+    'reps': reps,
+    'seconds': seconds,
+    'weightKg': weightKg,
+  };
+
+  factory SetLog.fromJson(Map<String, Object?> json) => SetLog(
+    exerciseId: json['exerciseId']! as String,
+    set: json['set']! as int,
+    reps: json['reps'] as int?,
+    seconds: json['seconds'] as int?,
+    weightKg: (json['weightKg'] as num?)?.toDouble(),
+  );
+}
+
+/// What a finished Session hands over to History.
+class SessionResult {
+  const SessionResult({
+    required this.plan,
+    required this.startedAt,
+    required this.endedAt,
+    required this.duration,
+    required this.complete,
+    required this.setLogs,
+  });
+
+  final Plan plan;
+  final DateTime startedAt;
+  final DateTime endedAt;
+
+  /// Time spent, without pauses.
+  final Duration duration;
+  final bool complete;
+  final List<SetLog> setLogs;
+}
+
+/// Runs a Plan's segments against a clock the caller supplies: holds,
+/// Transitions and started timed sets end by themselves on [tick]; rep sets
+/// and Rests wait for the user. [onCue] fires whenever a countdown ends.
+class SessionRunner extends ChangeNotifier {
+  SessionRunner(this.plan, {required DateTime startedAt, this.onCue})
+    : segments = buildSegments(plan),
+      _startedAt = startedAt {
+    _enter(0, startedAt);
+  }
+
+  final Plan plan;
+  final List<Segment> segments;
+  final VoidCallback? onCue;
+  final DateTime _startedAt;
+
+  var _index = 0;
+  DateTime? _segmentStart;
+  DateTime? _pausedAt;
+  var _pausedInSegment = Duration.zero;
+  var _pausedTotal = Duration.zero;
+  final _logs = <int, SetLog>{};
+  var _finished = false;
+  var _complete = false;
+  var _progress = false;
+  DateTime? _endedAt;
+
+  int get index => _index;
+  Segment get current => segments[_index];
+  Segment? get next => _index + 1 < segments.length ? segments[_index + 1] : null;
+  bool get isPaused => _pausedAt != null;
+  bool get isFinished => _finished;
+  bool get isComplete => _complete;
+
+  /// Whether a hold or set has been done, so ending early is worth saving.
+  bool get hasProgress => _progress;
+
+  /// A timed set that has not been started yet.
+  bool get isWaitingToStart => current is SetSegment && (current as SetSegment).target.isTimed && _segmentStart == null;
+
+  /// The countdown's length for holds, Transitions and timed sets; null otherwise.
+  Duration? get countdown => switch (current) {
+    HoldSegment(:final seconds) || TransitionSegment(:final seconds) => Duration(seconds: seconds),
+    SetSegment(:final target) when target.isTimed => Duration(seconds: target.seconds!),
+    _ => null,
+  };
+
+  /// Time on the current segment so far, without pauses.
+  Duration elapsed(DateTime now) {
+    final start = _segmentStart;
+    if (start == null) return Duration.zero;
+    final until = _pausedAt ?? now;
+    return until.difference(start) - _pausedInSegment;
+  }
+
+  Duration remaining(DateTime now) {
+    final length = countdown ?? Duration.zero;
+    final left = length - elapsed(now);
+    return left.isNegative ? Duration.zero : left;
+  }
+
+  void tick(DateTime now) {
+    if (_finished || isPaused || _segmentStart == null) return;
+    final length = countdown;
+    if (length == null || elapsed(now) < length) return;
+    final segment = current;
+    if (segment is HoldSegment) _progress = true;
+    if (segment is SetSegment) {
+      _progress = true;
+      _logs[_index] = SetLog(
+        exerciseId: segment.exerciseId,
+        set: segment.set,
+        seconds: segment.target.seconds,
+        weightKg: segment.weightKg,
+      );
+    }
+    onCue?.call();
+    _advance(now);
+  }
+
+  void pause(DateTime now) {
+    if (isPaused || _finished) return;
+    _pausedAt = now;
+    notifyListeners();
+  }
+
+  void resume(DateTime now) {
+    final pausedAt = _pausedAt;
+    if (pausedAt == null) return;
+    final paused = now.difference(pausedAt);
+    _pausedInSegment += paused;
+    _pausedTotal += paused;
+    _pausedAt = null;
+    notifyListeners();
+  }
+
+  /// Logs a rep set as done (or a timed set ended early) and moves on.
+  void completeSet({int? reps, int? seconds, double? weightKg, required DateTime now}) {
+    final segment = current as SetSegment;
+    _logs[_index] = SetLog(
+      exerciseId: segment.exerciseId,
+      set: segment.set,
+      reps: segment.target.isTimed ? null : reps,
+      seconds: segment.target.isTimed ? (seconds ?? segment.target.seconds) : null,
+      weightKg: weightKg,
+    );
+    _progress = true;
+    _advance(now);
+  }
+
+  void startTimer(DateTime now) {
+    if (!isWaitingToStart) return;
+    _segmentStart = now;
+    notifyListeners();
+  }
+
+  /// Leaves the Rest Screen for the next set.
+  void startNext(DateTime now) => _advance(now);
+
+  /// Moves on without logging anything.
+  void skip(DateTime now) {
+    if (_finished) return;
+    _resumeQuietly(now);
+    _advance(now);
+  }
+
+  /// Returns to the start of the previous hold or set, passing over
+  /// Transitions and Rests; on the first one, restarts it.
+  void back(DateTime now) {
+    if (_finished) return;
+    _resumeQuietly(now);
+    var target = _index - 1;
+    while (target > 0 && (segments[target] is TransitionSegment || segments[target] is RestSegment)) {
+      target--;
+    }
+    if (target < 0) target = 0;
+    _enter(target, now);
+    notifyListeners();
+  }
+
+  void end(DateTime now) {
+    if (_finished) return;
+    _resumeQuietly(now);
+    _finish(now, complete: false);
+  }
+
+  SessionResult result(DateTime now) {
+    final endedAt = _endedAt ?? now;
+    return SessionResult(
+      plan: plan,
+      startedAt: _startedAt,
+      endedAt: endedAt,
+      duration: endedAt.difference(_startedAt) - _pausedTotal,
+      complete: _complete,
+      setLogs: [for (final i in _logs.keys.toList()..sort()) _logs[i]!],
+    );
+  }
+
+  void _resumeQuietly(DateTime now) {
+    if (_pausedAt != null) {
+      _pausedTotal += now.difference(_pausedAt!);
+      _pausedAt = null;
+    }
+  }
+
+  void _advance(DateTime now) {
+    if (_index + 1 >= segments.length) {
+      _finish(now, complete: true);
+    } else {
+      _enter(_index + 1, now);
+      notifyListeners();
+    }
+  }
+
+  /// Holds, Transitions and Rests start their clock on arrival; sets wait.
+  void _enter(int index, DateTime now) {
+    _index = index;
+    _pausedInSegment = Duration.zero;
+    _segmentStart = segments[index] is SetSegment ? null : now;
+  }
+
+  void _finish(DateTime now, {required bool complete}) {
+    _finished = true;
+    _complete = complete;
+    _endedAt = now;
+    notifyListeners();
+  }
+}

lib/src/player/views/player_view.dart

@@ -0,0 +1,729 @@
+import 'dart:async';
+import 'dart:math' as math;
+
+import 'package:clock/clock.dart';
+import 'package:flutter/material.dart';
+import 'package:provider/provider.dart';
+
+import '../../design/number_stepper.dart';
+import '../../design/zen_style.dart';
+import '../../exercises/exercise_library.dart';
+import '../../exercises/views/flip_animation.dart';
+import '../../exercises/views/library_view.dart';
+import '../../history/session_repository.dart';
+import '../../localization/app_localizations.dart';
+import '../../plans/models/plan.dart';
+import '../../plans/plan_labels.dart';
+import '../../plans/plan_repository.dart';
+import '../../settings/settings_controller.dart';
+import '../player_effects.dart';
+import '../segments.dart';
+import '../session_runner.dart';
+import 'summary_view.dart';
+
+/// Runs a Plan one segment at a time: Stretching holds and Transitions count
+/// down and move on by themselves; Workout sets wait for "Set done" and the
+/// Rest Screen counts up. The screen stays on while it is open.
+class PlayerView extends StatefulWidget {
+  const PlayerView({super.key, required this.planId});
+
+  static const routeName = '/play';
+
+  final String planId;
+
+  @override
+  State<PlayerView> createState() => _PlayerViewState();
+}
+
+class _PlayerViewState extends State<PlayerView> {
+  SessionRunner? _runner;
+  Timer? _ticker;
+  var _leaving = false;
+  late final PlayerEffects _effects = context.read<PlayerEffects>();
+
+  @override
+  void initState() {
+    super.initState();
+    _effects.keepScreenOn(true);
+    _start();
+  }
+
+  Future<void> _start() async {
+    final plan = await context.read<PlanRepository>().get(widget.planId);
+    if (plan == null || !mounted) return;
+    final runner = SessionRunner(plan, startedAt: clock.now(), onCue: _chime)..addListener(_onChanged);
+    setState(() => _runner = runner);
+    _ticker = Timer.periodic(const Duration(milliseconds: 200), (_) {
+      runner.tick(clock.now());
+      if (mounted) setState(() {});
+    });
+  }
+
+  void _chime() {
+    final runner = _runner;
+    if (runner != null && !context.read<SettingsController>().muted) _effects.chime(runner.plan.mode);
+  }
+
+  void _onChanged() {
+    if (_runner!.isFinished) _leave();
+  }
+
+  /// Saves the Session and shows its summary. A Session in which no hold or
+  /// set was actually done (ended at once, or skipped through) is not worth
+  /// keeping and just closes the Player.
+  Future<void> _leave() async {
+    if (_leaving) return;
+    _leaving = true;
+    _ticker?.cancel();
+    final runner = _runner!;
+    final navigator = Navigator.of(context);
+    if (!runner.hasProgress) {
+      navigator.pop();
+      return;
+    }
+    final session = await context.read<SessionRepository>().save(runner.result(clock.now()));
+    navigator.pushReplacementNamed(SummaryView.routeName, arguments: session.id);
+  }
+
+  Future<void> _confirmEnd() async {
+    final runner = _runner;
+    if (runner == null) {
+      Navigator.of(context).pop();
+      return;
+    }
+    final l10n = AppLocalizations.of(context);
+    final end = await showDialog<bool>(
+      context: context,
+      builder: (context) => AlertDialog(
+        title: Text(l10n.endSessionTitle),
+        content: Text(l10n.endSessionBody),
+        actions: [
+          TextButton(onPressed: () => Navigator.of(context).pop(false), child: Text(l10n.keepGoing)),
+          FilledButton(onPressed: () => Navigator.of(context).pop(true), child: Text(l10n.endSession)),
+        ],
+      ),
+    );
+    if (end ?? false) runner.end(clock.now());
+  }
+
+  @override
+  void dispose() {
+    _ticker?.cancel();
+    _runner?.dispose();
+    _effects.keepScreenOn(false);
+    super.dispose();
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    final runner = _runner;
+    final s = ZenStyle.of(context);
+    return PopScope(
+      canPop: false,
+      onPopInvokedWithResult: (didPop, _) {
+        if (!didPop && !_leaving) _confirmEnd();
+      },
+      child: Scaffold(
+        body: runner == null
+            ? const SizedBox.shrink()
+            : Stack(
+                children: [
+                  _Pulse(on: _pulsing(runner), color: s.accent),
+                  SafeArea(
+                    child: Column(
+                      children: [
+                        _TopBar(runner: runner, onClose: _confirmEnd),
+                        Expanded(
+                          child: AnimatedSwitcher(
+                            duration: s.motion,
+                            switchInCurve: s.curve,
+                            switchOutCurve: s.curve,
+                            child: KeyedSubtree(key: ValueKey(runner.index), child: _content(runner)),
+                          ),
+                        ),
+                        Padding(
+                          padding: const EdgeInsets.fromLTRB(20, 8, 20, 20),
+                          child: _Controls(runner: runner),
+                        ),
+                      ],
+                    ),
+                  ),
+                ],
+              ),
+      ),
+    );
+  }
+
+  /// The last three seconds of a running countdown.
+  bool _pulsing(SessionRunner runner) {
+    if (runner.countdown == null || runner.isPaused || runner.isWaitingToStart) return false;
+    final left = runner.remaining(clock.now());
+    return left > Duration.zero && left <= const Duration(seconds: 3) && (left.inMilliseconds ~/ 500).isEven;
+  }
+
+  Widget _content(SessionRunner runner) => switch (runner.current) {
+    final HoldSegment hold => _HoldContent(runner: runner, hold: hold),
+    final TransitionSegment transition => _TransitionContent(runner: runner, transition: transition),
+    final SetSegment set => _SetContent(runner: runner, set: set),
+    RestSegment() => _RestContent(runner: runner),
+  };
+}
+
+class _Pulse extends StatelessWidget {
+  const _Pulse({required this.on, required this.color});
+
+  final bool on;
+  final Color color;
+
+  @override
+  Widget build(BuildContext context) => Positioned.fill(
+    child: IgnorePointer(
+      child: AnimatedOpacity(
+        opacity: on ? 0.16 : 0,
+        duration: const Duration(milliseconds: 300),
+        child: ColoredBox(color: color),
+      ),
+    ),
+  );
+}
+
+class _TopBar extends StatelessWidget {
+  const _TopBar({required this.runner, required this.onClose});
+
+  final SessionRunner runner;
+  final VoidCallback onClose;
+
+  @override
+  Widget build(BuildContext context) {
+    final l10n = AppLocalizations.of(context);
+    final s = ZenStyle.of(context);
+    final settings = context.watch<SettingsController>();
+    final main = [
+      for (final (i, seg) in runner.segments.indexed)
+        if (seg is HoldSegment || seg is SetSegment) i,
+    ];
+    final done = main.where((i) => i < runner.index).length;
+    return Column(
+      children: [
+        Row(
+          children: [
+            IconButton(tooltip: l10n.playerClose, onPressed: onClose, icon: const Icon(Icons.close_rounded)),
+            Expanded(
+              child: Text(
+                runner.plan.name,
+                textAlign: TextAlign.center,
+                maxLines: 1,
+                overflow: TextOverflow.ellipsis,
+                style: Theme.of(context).textTheme.titleSmall?.copyWith(color: s.inkMuted),
+              ),
+            ),
+            IconButton(
+              tooltip: settings.muted ? l10n.unmute : l10n.mute,
+              onPressed: () => settings.updateMuted(!settings.muted),
+              icon: Icon(settings.muted ? Icons.volume_off_rounded : Icons.volume_up_rounded),
+            ),
+          ],
+        ),
+        Padding(
+          padding: const EdgeInsets.symmetric(horizontal: 20),
+          child: ClipRRect(
+            borderRadius: BorderRadius.circular(s.controlRadius.clamp(0, 3)),
+            child: LinearProgressIndicator(
+              value: main.isEmpty ? 0 : done / main.length,
+              minHeight: 6,
+              color: s.accent,
+              backgroundColor: s.surfaceSoft,
+            ),
+          ),
+        ),
+      ],
+    );
+  }
+}
+
+/// Image, name and a line of context above the segment's main figure.
+class _ExerciseHeader extends StatelessWidget {
+  const _ExerciseHeader({required this.exerciseId, required this.caption});
+
+  final String exerciseId;
+  final String caption;
+
+  @override
+  Widget build(BuildContext context) {
+    final s = ZenStyle.of(context);
+    final text = Theme.of(context).textTheme;
+    final exercise = context.read<ExerciseLibrary>().byId(exerciseId);
+    return Column(
+      children: [
+        if (exercise != null)
+          ConstrainedBox(
+            constraints: BoxConstraints(maxHeight: MediaQuery.sizeOf(context).height * 0.28),
+            child: FlipAnimation(exercise: exercise),
+          ),
+        const SizedBox(height: 16),
+        Text(
+          exercise?.name ?? exerciseId,
+          textAlign: TextAlign.center,
+          style: text.headlineSmall,
+          maxLines: 2,
+          overflow: TextOverflow.ellipsis,
+        ),
+        const SizedBox(height: 4),
+        Text(caption, style: text.bodyLarge?.copyWith(color: s.inkMuted)),
+      ],
+    );
+  }
+}
+
+class _HoldContent extends StatelessWidget {
+  const _HoldContent({required this.runner, required this.hold});
+
+  final SessionRunner runner;
+  final HoldSegment hold;
+
+  @override
+  Widget build(BuildContext context) {
+    final l10n = AppLocalizations.of(context);
+    final caption = [
+      if (hold.side != null) hold.side == Side.left ? l10n.sideLeft : l10n.sideRight,
+      if (hold.rounds > 1) l10n.roundOf(hold.round, hold.rounds),
+    ].join(' · ');
+    return _Centered(
+      children: [
+        _ExerciseHeader(exerciseId: hold.exerciseId, caption: caption),
+        const SizedBox(height: 24),
+        _CountdownRing(runner: runner, size: 190),
+      ],
+    );
+  }
+}
+
+class _TransitionContent extends StatelessWidget {
+  const _TransitionContent({required this.runner, required this.transition});
+
+  final SessionRunner runner;
+  final TransitionSegment transition;
+
+  @override
+  Widget build(BuildContext context) {
+    final l10n = AppLocalizations.of(context);
+    final s = ZenStyle.of(context);
+    final text = Theme.of(context).textTheme;
+    final next = runner.next;
+    final title = switch (transition.kind) {
+      TransitionKind.getReady => l10n.transitionGetReady,
+      TransitionKind.switchSides => l10n.transitionSwitchSides,
+      TransitionKind.nextRound => l10n.transitionNextRound(next is HoldSegment ? next.round : 1),
+      TransitionKind.nextExercise => l10n.transitionNextExercise,
+    };
+    final exercise = next?.exerciseId == null ? null : context.read<ExerciseLibrary>().byId(next!.exerciseId!);
+    return _Centered(
+      children: [
+        Text(
+          title,
+          style: text.displaySmall?.copyWith(color: s.accent),
+          textAlign: TextAlign.center,
+        ),
+        const SizedBox(height: 24),
+        if (exercise != null) ...[
+          ExerciseThumbnail(exercise: exercise, size: 120),
+          const SizedBox(height: 12),
+          Text(exercise.name, style: text.titleLarge, textAlign: TextAlign.center),
+        ],
+        const SizedBox(height: 28),
+        _CountdownRing(runner: runner, size: 120),
+      ],
+    );
+  }
+}
+
+class _SetContent extends StatelessWidget {
+  const _SetContent({required this.runner, required this.set});
+
+  final SessionRunner runner;
+  final SetSegment set;
+
+  @override
+  Widget build(BuildContext context) {
+    final l10n = AppLocalizations.of(context);
+    final s = ZenStyle.of(context);
+    final text = Theme.of(context).textTheme;
+    final target = [
+      targetLabel(l10n, set.target),
+      if (set.weightKg != null) l10n.weightKg(kgNumber(set.weightKg!)),
+    ].join(' · ');
+    return _Centered(
+      children: [
+        _ExerciseHeader(exerciseId: set.exerciseId, caption: l10n.setOf(set.set, set.sets)),
+        const SizedBox(height: 24),
+        if (set.target.isTimed && !runner.isWaitingToStart)
+          _CountdownRing(runner: runner, size: 170)
+        else
+          Text(
+            target,
+            style: text.displaySmall?.copyWith(color: s.accent),
+            textAlign: TextAlign.center,
+          ),
+      ],
+    );
+  }
+}
+
+class _RestContent extends StatelessWidget {
+  const _RestContent({required this.runner});
+
+  final SessionRunner runner;
+
+  @override
+  Widget build(BuildContext context) {
+    final l10n = AppLocalizations.of(context);
+    final s = ZenStyle.of(context);
+    final text = Theme.of(context).textTheme;
+    final next = runner.next;
+    final exercise = next is SetSegment ? context.read<ExerciseLibrary>().byId(next.exerciseId) : null;
+    return _Centered(
+      children: [
+        Text(l10n.restTitle, style: text.headlineMedium?.copyWith(color: s.inkMuted)),
+        const SizedBox(height: 8),
+        Text(
+          clockText(runner.elapsed(clock.now())),
+          style: text.displayLarge?.copyWith(
+            fontFamily: s.headingFont,
+            fontWeight: FontWeight.w800,
+            fontFeatures: const [FontFeature.tabularFigures()],
+          ),
+        ),
+        const SizedBox(height: 32),
+        if (next is SetSegment && exercise != null)
+          Card(
+            child: Padding(
+              padding: const EdgeInsets.all(12),
+              child: Row(
+                children: [
+                  ExerciseThumbnail(exercise: exercise, size: 64),
+                  const SizedBox(width: 14),
+                  Expanded(
+                    child: Column(
+                      crossAxisAlignment: CrossAxisAlignment.start,
+                      children: [
+                        Text(l10n.restNext, style: text.bodySmall?.copyWith(color: s.inkMuted)),
+                        Text(exercise.name, style: text.titleMedium, maxLines: 2, overflow: TextOverflow.ellipsis),
+                        Text(
+                          '${l10n.setOf(next.set, next.sets)} · ${targetLabel(l10n, next.target)}',
+                          style: text.bodySmall?.copyWith(color: s.inkMuted),
+                        ),
+                      ],
+                    ),
+                  ),
+                ],
+              ),
+            ),
+          ),
+      ],
+    );
+  }
+}
+
+class _Centered extends StatelessWidget {
+  const _Centered({required this.children});
+
+  final List<Widget> children;
+
+  @override
+  Widget build(BuildContext context) => Center(
+    child: SingleChildScrollView(
+      padding: const EdgeInsets.symmetric(horizontal: 20, vertical: 16),
+      child: Column(mainAxisSize: MainAxisSize.min, children: children),
+    ),
+  );
+}
+
+/// "1:05".
+String clockText(Duration d) => '${d.inMinutes}:${(d.inSeconds % 60).toString().padLeft(2, '0')}';
+
+/// The current countdown as a draining ring with the seconds left inside.
+class _CountdownRing extends StatelessWidget {
+  const _CountdownRing({required this.runner, required this.size});
+
+  final SessionRunner runner;
+  final double size;
+
+  @override
+  Widget build(BuildContext context) {
+    final s = ZenStyle.of(context);
+    final total = runner.countdown ?? Duration.zero;
+    final left = runner.remaining(clock.now());
+    final fraction = total == Duration.zero ? 0.0 : left.inMilliseconds / total.inMilliseconds;
+    final seconds = (left.inMilliseconds / 1000).ceil();
+    return SizedBox.square(
+      dimension: size,
+      child: CustomPaint(
+        painter: _RingPainter(
+          fraction: fraction,
+          track: s.surfaceSoft,
+          colors: [s.accent, s.accentEnd],
+          round: s.controlRadius > 20,
+        ),
+        child: Center(
+          child: Text(
+            seconds >= 60 ? clockText(Duration(seconds: seconds)) : '$seconds',
+            style: TextStyle(
+              fontFamily: s.headingFont,
+              fontWeight: FontWeight.w800,
+              fontSize: size * 0.3,
+              color: runner.isPaused ? s.inkMuted : s.ink,
+              fontFeatures: const [FontFeature.tabularFigures()],
+            ),
+          ),
+        ),
+      ),
+    );
+  }
+}
+
+class _RingPainter extends CustomPainter {
+  _RingPainter({required this.fraction, required this.track, required this.colors, required this.round});
+
+  final double fraction;
+  final Color track;
+  final List<Color> colors;
+  final bool round;
+
+  @override
+  void paint(Canvas canvas, Size size) {
+    final stroke = size.width * 0.07;
+    final rect = Offset.zero & size;
+    final arc = rect.deflate(stroke / 2);
+    canvas.drawArc(
+      arc,
+      0,
+      math.pi * 2,
+      false,
+      Paint()
+        ..style = PaintingStyle.stroke
+        ..strokeWidth = stroke
+        ..color = track,
+    );
+    if (fraction <= 0) return;
+    canvas.drawArc(
+      arc,
+      -math.pi / 2,
+      math.pi * 2 * fraction,
+      false,
+      Paint()
+        ..style = PaintingStyle.stroke
+        ..strokeWidth = stroke
+        ..strokeCap = round ? StrokeCap.round : StrokeCap.butt
+        ..shader = SweepGradient(
+          colors: colors,
+          startAngle: -math.pi / 2,
+          endAngle: math.pi * 1.5,
+          transform: const GradientRotation(-math.pi / 2),
+        ).createShader(rect),
+    );
+  }
+
+  @override
+  bool shouldRepaint(_RingPainter old) => old.fraction != fraction || old.track != track || old.colors != colors;
+}
+
+class _Controls extends StatelessWidget {
+  const _Controls({required this.runner});
+
+  final SessionRunner runner;
+
+  @override
+  Widget build(BuildContext context) {
+    final l10n = AppLocalizations.of(context);
+    final segment = runner.current;
+    final back = IconButton.filledTonal(
+      tooltip: l10n.previous,
+      onPressed: () => runner.back(clock.now()),
+      icon: const Icon(Icons.skip_previous_rounded),
+    );
+    final skip = IconButton.filledTonal(
+      tooltip: l10n.skip,
+      onPressed: () => runner.skip(clock.now()),
+      icon: const Icon(Icons.skip_next_rounded),
+    );
+    final Widget main = switch (segment) {
+      RestSegment() => _BigButton(label: l10n.startNextSet, onPressed: () => runner.startNext(clock.now())),
+      SetSegment() when runner.isWaitingToStart => _BigButton(
+        label: l10n.start,
+        onPressed: () => runner.startTimer(clock.now()),
+      ),
+      final SetSegment set when !set.target.isTimed => _BigButton(
+        label: l10n.setDone,
+        onPressed: () => _logRepSet(context, set),
+      ),
+      _ => _PauseButton(runner: runner),
+    };
+    return Column(
+      mainAxisSize: MainAxisSize.min,
+      children: [
+        if (segment is SetSegment && segment.target.isTimed && !runner.isWaitingToStart)
+          TextButton(
+            onPressed: () => runner.completeSet(
+              seconds: runner.elapsed(clock.now()).inSeconds,
+              weightKg: segment.weightKg,
+              now: clock.now(),
+            ),
+            child: Text(l10n.doneEarly),
+          ),
+        Row(
+          children: [
+            back,
+            const SizedBox(width: 16),
+            Expanded(child: Center(child: main)),
+            const SizedBox(width: 16),
+            if (segment is RestSegment) const SizedBox(width: 40) else skip,
+          ],
+        ),
+      ],
+    );
+  }
+
+  Future<void> _logRepSet(BuildContext context, SetSegment set) async {
+    final logged = await showModalBottomSheet<(int, double?)>(
+      context: context,
+      showDragHandle: true,
+      isScrollControlled: true,
+      builder: (context) => _SetLogSheet(set: set),
+    );
+    if (logged != null && !runner.isFinished && runner.current == set) {
+      runner.completeSet(reps: logged.$1, weightKg: logged.$2, now: clock.now());
+    }
+  }
+}
+
+class _BigButton extends StatelessWidget {
+  const _BigButton({required this.label, required this.onPressed});
+
+  final String label;
+  final VoidCallback onPressed;
+
+  @override
+  Widget build(BuildContext context) {
+    final s = ZenStyle.of(context);
+    return SizedBox(
+      width: double.infinity,
+      height: 60,
+      child: DecoratedBox(
+        decoration: BoxDecoration(
+          gradient: s.accentGradient,
+          borderRadius: BorderRadius.circular(s.controlRadius.clamp(0, 30)),
+        ),
+        child: FilledButton(
+          style: FilledButton.styleFrom(backgroundColor: Colors.transparent, shadowColor: Colors.transparent),
+          onPressed: onPressed,
+          child: Text(
+            label,
+            style: TextStyle(fontFamily: s.headingFont, fontWeight: FontWeight.w800, fontSize: 20),
+          ),
+        ),
+      ),
+    );
+  }
+}
+
+class _PauseButton extends StatelessWidget {
+  const _PauseButton({required this.runner});
+
+  final SessionRunner runner;
+
+  @override
+  Widget build(BuildContext context) {
+    final l10n = AppLocalizations.of(context);
+    final s = ZenStyle.of(context);
+    final paused = runner.isPaused;
+    return Semantics(
+      button: true,
+      label: paused ? l10n.resume : l10n.pause,
+      child: Material(
+        color: s.accent,
+        borderRadius: BorderRadius.circular(s.controlRadius.clamp(0, 36)),
+        child: InkWell(
+          borderRadius: BorderRadius.circular(s.controlRadius.clamp(0, 36)),
+          onTap: () => paused ? runner.resume(clock.now()) : runner.pause(clock.now()),
+          child: Tooltip(
+            message: paused ? l10n.resume : l10n.pause,
+            child: SizedBox.square(
+              dimension: 72,
+              child: Icon(paused ? Icons.play_arrow_rounded : Icons.pause_rounded, size: 40, color: s.onAccent),
+            ),
+          ),
+        ),
+      ),
+    );
+  }
+}
+
+/// Confirms a rep set: the target reps and weight come prefilled, so hitting
+/// the target is a single tap.
+class _SetLogSheet extends StatefulWidget {
+  const _SetLogSheet({required this.set});
+
+  final SetSegment set;
+
+  @override
+  State<_SetLogSheet> createState() => _SetLogSheetState();
+}
+
+class _SetLogSheetState extends State<_SetLogSheet> {
+  late int _reps = widget.set.target.reps ?? 10;
+  late double? _kg = widget.set.weightKg;
+
+  @override
+  Widget build(BuildContext context) {
+    final l10n = AppLocalizations.of(context);
+    final text = Theme.of(context).textTheme;
+    final kg = _kg;
+    return SafeArea(
+      child: Padding(
+        padding: const EdgeInsets.fromLTRB(20, 0, 20, 16),
+        child: Column(
+          mainAxisSize: MainAxisSize.min,
+          crossAxisAlignment: CrossAxisAlignment.start,
+          children: [
+            Text(l10n.logSetTitle, style: text.titleLarge),
+            const SizedBox(height: 8),
+            NumberStepper(
+              label: l10n.stepReps,
+              value: '$_reps',
+              onDecrement: _reps > 0 ? () => setState(() => _reps--) : null,
+              onIncrement: _reps < 200 ? () => setState(() => _reps++) : null,
+            ),
+            if (kg != null)
+              NumberStepper(
+                label: l10n.stepWeight,
+                value: l10n.weightKg(kgNumber(kg)),
+                onDecrement: kg >= 2.5 ? () => setState(() => _kg = kg - 2.5) : null,
+                onIncrement: () => setState(() => _kg = kg + 2.5),
+              )
+            else
+              Padding(
+                padding: const EdgeInsets.only(top: 8),
+                child: OutlinedButton.icon(
+                  onPressed: () => setState(() => _kg = 20),
+                  icon: const Icon(Icons.add_rounded),
+                  label: Text(l10n.logWeight),
+                ),
+              ),
+            const SizedBox(height: 16),
+            SizedBox(
+              width: double.infinity,
+              height: 52,
+              child: FilledButton(onPressed: () => Navigator.of(context).pop((_reps, _kg)), child: Text(l10n.saveSet)),
+            ),
+          ],
+        ),
+      ),
+    );
+  }
+}
+
+/// Lets the editor and the Plans list start a Plan, unless it has no Steps.
+void startPlan(BuildContext context, Plan plan) {
+  if (plan.items.isEmpty) return;
+  Navigator.of(context).pushNamed(PlayerView.routeName, arguments: plan.id);
+}

lib/src/player/views/summary_view.dart

@@ -0,0 +1,159 @@
+import 'package:flutter/material.dart';
+import 'package:provider/provider.dart';
+
+import '../../design/zen_style.dart';
+import '../../exercises/exercise_library.dart';
+import '../../history/session_repository.dart';
+import '../../localization/app_localizations.dart';
+import '../../modes/mode.dart';
+import '../../plans/models/plan.dart';
+import '../../plans/plan_labels.dart';
+import '../session_runner.dart';
+
+/// Shown when a Session ends: how long it took, what was done and, for
+/// Workouts, every logged set.
+class SummaryView extends StatelessWidget {
+  const SummaryView({super.key, required this.sessionId});
+
+  static const routeName = '/summary';
+
+  final String sessionId;
+
+  @override
+  Widget build(BuildContext context) {
+    final l10n = AppLocalizations.of(context);
+    final s = ZenStyle.of(context);
+    final text = Theme.of(context).textTheme;
+    return Scaffold(
+      body: FutureBuilder(
+        future: context.read<SessionRepository>().get(sessionId),
+        builder: (context, snapshot) {
+          final session = snapshot.data;
+          if (session == null) return const SizedBox.shrink();
+          final exercises = {
+            for (final item in session.items)
+              ...switch (item) {
+                WorkoutStep(:final exerciseId) || StretchingStep(:final exerciseId) => [exerciseId],
+                Superset(:final members) => members.map((m) => m.exerciseId),
+              },
+          };
+          return SafeArea(
+            child: ListView(
+              padding: const EdgeInsets.fromLTRB(20, 40, 20, 24),
+              children: [
+                Icon(
+                  session.complete ? Icons.check_circle_rounded : Icons.flag_rounded,
+                  size: 56,
+                  color: session.complete ? s.accent : s.inkMuted,
+                ),
+                const SizedBox(height: 16),
+                Text(session.complete ? l10n.summaryComplete : l10n.summaryIncomplete, style: text.headlineLarge),
+                const SizedBox(height: 4),
+                Text(session.planName, style: text.titleMedium?.copyWith(color: s.inkMuted)),
+                const SizedBox(height: 28),
+                Row(
+                  children: [
+                    Expanded(
+                      child: _Stat(
+                        label: l10n.summaryDuration,
+                        value: l10n.durationMinutes((session.duration.inSeconds / 60).round()),
+                      ),
+                    ),
+                    const SizedBox(width: 10),
+                    Expanded(
+                      child: session.mode == Mode.workout
+                          ? _Stat(label: l10n.summarySets, value: '${session.setLogs.length}')
+                          : _Stat(label: l10n.summaryExercises, value: '${exercises.length}'),
+                    ),
+                  ],
+                ),
+                if (session.setLogs.isNotEmpty) ...[
+                  const SizedBox(height: 28),
+                  Text(l10n.summaryLogTitle, style: text.titleMedium),
+                  const SizedBox(height: 10),
+                  for (final group in _byExercise(session.setLogs)) _LogGroup(logs: group),
+                ],
+                const SizedBox(height: 28),
+                SizedBox(
+                  height: 52,
+                  child: FilledButton(onPressed: () => Navigator.of(context).pop(), child: Text(l10n.done)),
+                ),
+              ],
+            ),
+          );
+        },
+      ),
+    );
+  }
+
+  /// Consecutive logs of the same Exercise together, as they were done.
+  static List<List<SetLog>> _byExercise(List<SetLog> logs) {
+    final groups = <List<SetLog>>[];
+    for (final log in logs) {
+      if (groups.isNotEmpty && groups.last.first.exerciseId == log.exerciseId) {
+        groups.last.add(log);
+      } else {
+        groups.add([log]);
+      }
+    }
+    return groups;
+  }
+}
+
+class _Stat extends StatelessWidget {
+  const _Stat({required this.label, required this.value});
+
+  final String label;
+  final String value;
+
+  @override
+  Widget build(BuildContext context) {
+    final s = ZenStyle.of(context);
+    final text = Theme.of(context).textTheme;
+    return Container(
+      padding: const EdgeInsets.all(16),
+      decoration: BoxDecoration(color: s.surface, borderRadius: BorderRadius.circular(s.radius * 0.7)),
+      child: Column(
+        crossAxisAlignment: CrossAxisAlignment.start,
+        children: [
+          Text(label, style: text.bodySmall?.copyWith(color: s.inkMuted)),
+          const SizedBox(height: 4),
+          Text(value, style: text.headlineSmall),
+        ],
+      ),
+    );
+  }
+}
+
+class _LogGroup extends StatelessWidget {
+  const _LogGroup({required this.logs});
+
+  final List<SetLog> logs;
+
+  @override
+  Widget build(BuildContext context) {
+    final l10n = AppLocalizations.of(context);
+    final s = ZenStyle.of(context);
+    final text = Theme.of(context).textTheme;
+    final name = context.read<ExerciseLibrary>().byId(logs.first.exerciseId)?.name ?? logs.first.exerciseId;
+    return Padding(
+      padding: const EdgeInsets.only(bottom: 14),
+      child: Column(
+        crossAxisAlignment: CrossAxisAlignment.start,
+        children: [
+          Text(name, style: text.titleSmall),
+          for (final log in logs)
+            Text(
+              [
+                l10n.setLogLine(log.set),
+                if (log.reps != null) l10n.repsCount(log.reps!),
+                if (log.seconds != null) l10n.secondsShort(log.seconds!),
+                if (log.weightKg != null) l10n.weightKg(kgNumber(log.weightKg!)),
+              ].join(' · '),
+              style: text.bodyMedium?.copyWith(color: s.inkMuted),
+            ),
+        ],
+      ),
+    );
+  }
+}

lib/src/settings/settings_controller.dart

@@ -6,11 +6,17 @@ import '../modes/mode.dart';
 /// Stores the user's app preferences on the device.
 class SettingsService {
   static const _modeKey = 'mode';
+  static const _mutedKey = 'muted';
 
   /// The last-used Mode; Stretching on first launch.
   Future<Mode> mode() async => Mode.fromName((await SharedPreferences.getInstance()).getString(_modeKey));
 
   Future<void> updateMode(Mode mode) async => (await SharedPreferences.getInstance()).setString(_modeKey, mode.name);
+
+  /// Whether the Player's chime is muted; sound is on by default.
+  Future<bool> muted() async => (await SharedPreferences.getInstance()).getBool(_mutedKey) ?? false;
+
+  Future<void> updateMuted(bool muted) async => (await SharedPreferences.getInstance()).setBool(_mutedKey, muted);
 }
 
 class SettingsController extends ChangeNotifier {
@@ -18,14 +24,23 @@ class SettingsController extends ChangeNotifier {
 
   final SettingsService _service;
   Mode _mode = Mode.stretching;
+  bool _muted = false;
 
   Mode get mode => _mode;
+  bool get muted => _muted;
 
   Future<void> loadSettings() async {
     _mode = await _service.mode();
+    _muted = await _service.muted();
     notifyListeners();
   }
 
+  Future<void> updateMuted(bool muted) async {
+    _muted = muted;
+    notifyListeners();
+    await _service.updateMuted(muted);
+  }
+
   Future<void> updateMode(Mode mode) async {
     if (mode == _mode) return;
     _mode = mode;

pubspec.lock

@@ -33,6 +33,62 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "2.13.0"
+  audioplayers:
+    dependency: "direct main"
+    description:
+      name: audioplayers
+      sha256: a72dd459d1a48f61a6fb9c0134dba26597c9236af40639ff0eb70eb4e0baab70
+      url: "https://pub.dev"
+    source: hosted
+    version: "6.6.0"
+  audioplayers_android:
+    dependency: transitive
+    description:
+      name: audioplayers_android
+      sha256: "60a6728277228413a85755bd3ffd6fab98f6555608923813ce383b190a360605"
+      url: "https://pub.dev"
+    source: hosted
+    version: "5.2.1"
+  audioplayers_darwin:
+    dependency: transitive
+    description:
+      name: audioplayers_darwin
+      sha256: c994b3bb3a921e4904ac40e013fbc94488e824fd7c1de6326f549943b0b44a91
+      url: "https://pub.dev"
+    source: hosted
+    version: "6.4.0"
+  audioplayers_linux:
+    dependency: transitive
+    description:
+      name: audioplayers_linux
+      sha256: f75bce1ce864170ef5e6a2c6a61cd3339e1a17ce11e99a25bae4474ea491d001
+      url: "https://pub.dev"
+    source: hosted
+    version: "4.2.1"
+  audioplayers_platform_interface:
+    dependency: transitive
+    description:
+      name: audioplayers_platform_interface
+      sha256: "0e2f6a919ab56d0fec272e801abc07b26ae7f31980f912f24af4748763e5a656"
+      url: "https://pub.dev"
+    source: hosted
+    version: "7.1.1"
+  audioplayers_web:
+    dependency: transitive
+    description:
+      name: audioplayers_web
+      sha256: faa8fa6587f996a6f604433b53af44c57a1407d4fe8dff5766cf63d6875e8de9
+      url: "https://pub.dev"
+    source: hosted
+    version: "5.2.0"
+  audioplayers_windows:
+    dependency: transitive
+    description:
+      name: audioplayers_windows
+      sha256: bafff2b38b6f6d331887558ba6e0a01c9c208d9dbb3ad0005234db065122a734
+      url: "https://pub.dev"
+    source: hosted
+    version: "4.3.0"
   boolean_selector:
     dependency: transitive
     description:
@@ -122,7 +178,7 @@ packages:
     source: hosted
     version: "0.4.2"
   clock:
-    dependency: transitive
+    dependency: "direct main"
     description:
       name: clock
       sha256: fddb70d9b5277016c77a80201021d40a2247104d9f4aa7bab7157b7e3f05b84b
@@ -161,6 +217,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "3.1.2"
+  dbus:
+    dependency: transitive
+    description:
+      name: dbus
+      sha256: a48d5da28e89bd02196e80d81ed8d7954923d00a0f4a68cc20b575038f023383
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.7.15"
   drift:
     dependency: "direct main"
     description:
@@ -261,6 +325,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "2.3.2"
+  http:
+    dependency: transitive
+    description:
+      name: http
+      sha256: "87721a4a50b19c7f1d49001e51409bddc46303966ce89a65af4f4e6004896412"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.6.0"
   http_multi_server:
     dependency: transitive
     description:
@@ -389,6 +461,22 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "2.2.0"
+  package_info_plus:
+    dependency: transitive
+    description:
+      name: package_info_plus
+      sha256: "468c26b4254ab01979fa5e4a98cb343ea3631b9acee6f21028997419a80e1a20"
+      url: "https://pub.dev"
+    source: hosted
+    version: "9.0.1"
+  package_info_plus_platform_interface:
+    dependency: transitive
+    description:
+      name: package_info_plus_platform_interface
+      sha256: "202a487f08836a592a6bd4f901ac69b3a8f146af552bbd14407b6b41e1c3f086"
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.2.1"
   path:
     dependency: transitive
     description:
@@ -445,6 +533,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "2.3.0"
+  petitparser:
+    dependency: transitive
+    description:
+      name: petitparser
+      sha256: "91bd59303e9f769f108f8df05e371341b15d59e995e6806aefab827b58336675"
+      url: "https://pub.dev"
+    source: hosted
+    version: "7.0.2"
   platform:
     dependency: transitive
     description:
@@ -650,6 +746,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "1.4.1"
+  synchronized:
+    dependency: transitive
+    description:
+      name: synchronized
+      sha256: c254ade258ec8282947a0acbbc90b9575b4f19673533ee46f2f6e9b3aeefd7c0
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.4.0"
   term_glyph:
     dependency: transitive
     description:
@@ -698,6 +802,22 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "15.0.0"
+  wakelock_plus:
+    dependency: "direct main"
+    description:
+      name: wakelock_plus
+      sha256: "9296d40c9adbedaba95d1e704f4e0b434be446e2792948d0e4aa977048104228"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.4.0"
+  wakelock_plus_platform_interface:
+    dependency: transitive
+    description:
+      name: wakelock_plus_platform_interface
+      sha256: "036deb14cd62f558ca3b73006d52ce049fabcdcb2eddfe0bf0fe4e8a943b5cf2"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.3.0"
   watcher:
     dependency: transitive
     description:
@@ -730,6 +850,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "3.0.3"
+  win32:
+    dependency: transitive
+    description:
+      name: win32
+      sha256: d7cb55e04cd34096cd3a79b3330245f54cb96a370a1c27adb3c84b917de8b08e
+      url: "https://pub.dev"
+    source: hosted
+    version: "5.15.0"
   xdg_directories:
     dependency: transitive
     description:
@@ -738,6 +866,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "1.1.0"
+  xml:
+    dependency: transitive
+    description:
+      name: xml
+      sha256: "971043b3a0d3da28727e40ed3e0b5d18b742fa5a68665cca88e74b7876d5e025"
+      url: "https://pub.dev"
+    source: hosted
+    version: "6.6.1"
   yaml:
     dependency: transitive
     description:

pubspec.yaml

@@ -7,6 +7,8 @@ environment:
   sdk: ^3.8.1
 
 dependencies:
+  audioplayers: ^6.1.0
+  clock: ^1.1.1
   drift: ^2.31.0
   drift_flutter: ^0.2.8
   flutter:
@@ -17,6 +19,7 @@ dependencies:
   provider: ^6.1.5+1
   shared_preferences: ^2.5.3
   uuid: ^4.6.0
+  wakelock_plus: ^1.4.0
 
 dev_dependencies:
   flutter_test:
@@ -33,6 +36,7 @@ flutter:
   assets:
     - assets/exercises/
     - assets/exercises/images/
+    - assets/sounds/
 
   fonts:
     # Stretching Mode

test/history/session_repository_test.dart

@@ -0,0 +1,58 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:zenxercise/src/database/database.dart';
+import 'package:zenxercise/src/history/session_repository.dart';
+import 'package:zenxercise/src/modes/mode.dart';
+import 'package:zenxercise/src/plans/models/plan.dart';
+import 'package:zenxercise/src/player/session_runner.dart';
+
+import '../support/test_database.dart';
+
+void main() {
+  late AppDatabase db;
+  late SessionRepository sessions;
+
+  setUp(() {
+    db = testDatabase();
+    sessions = SessionRepository(db);
+  });
+  tearDown(() => db.close());
+
+  Plan plan(Mode mode) => Plan(
+    id: 'p1',
+    mode: mode,
+    name: 'Legs',
+    items: const [WorkoutStep(exerciseId: 'Squat', sets: 1, target: WorkoutTarget.reps(10))],
+    createdAt: DateTime(2026),
+    updatedAt: DateTime(2026),
+  );
+
+  SessionResult result(Mode mode, DateTime end, {bool complete = true}) => SessionResult(
+    plan: plan(mode),
+    startedAt: end.subtract(const Duration(minutes: 30)),
+    endedAt: end,
+    duration: const Duration(minutes: 28),
+    complete: complete,
+    setLogs: const [SetLog(exerciseId: 'Squat', set: 1, reps: 8, weightKg: 60)],
+  );
+
+  test('a saved Session keeps its Plan snapshot, logs and outcome', () async {
+    final saved = await sessions.save(result(Mode.workout, DateTime(2026, 10, 29, 19), complete: false));
+
+    expect(saved.planName, 'Legs');
+    expect(saved.items.single, isA<WorkoutStep>());
+    expect(saved.duration, const Duration(minutes: 28));
+    expect(saved.complete, isFalse);
+    expect(saved.setLogs.single.reps, 8);
+    expect(saved.setLogs.single.weightKg, 60);
+  });
+
+  test('Sessions are listed per Mode, the latest first', () async {
+    await sessions.save(result(Mode.workout, DateTime(2026, 10, 28)));
+    await sessions.save(result(Mode.workout, DateTime(2026, 10, 29)));
+    await sessions.save(result(Mode.stretching, DateTime(2026, 10, 30)));
+
+    final workout = await sessions.watchSessions(Mode.workout).first;
+
+    expect(workout.map((s) => s.endedAt.day), [29, 28]);
+  });
+}

test/player/segments_test.dart

@@ -0,0 +1,119 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:zenxercise/src/modes/mode.dart';
+import 'package:zenxercise/src/plans/models/plan.dart';
+import 'package:zenxercise/src/player/segments.dart';
+
+Plan _plan(Mode mode, List<PlanItem> items, {int transition = 5}) => Plan(
+  id: 'p',
+  mode: mode,
+  name: 'P',
+  items: items,
+  transitionSeconds: transition,
+  createdAt: DateTime(2026),
+  updatedAt: DateTime(2026),
+);
+
+String _describe(Segment s) => switch (s) {
+  HoldSegment(:final exerciseId, :final side, :final round) =>
+    'hold $exerciseId${side == null ? '' : ' ${side.name}'} r$round',
+  TransitionSegment(:final kind, :final seconds) => '${kind.name} ${seconds}s',
+  SetSegment(:final exerciseId, :final set) => 'set $exerciseId $set',
+  RestSegment() => 'rest',
+};
+
+void main() {
+  group('Stretching', () {
+    test('holds every side and round with Transitions between, after a get-ready', () {
+      final segments = buildSegments(
+        _plan(Mode.stretching, const [
+          StretchingStep(exerciseId: 'A', holdSeconds: 30, bothSides: true, rounds: 2),
+          StretchingStep(exerciseId: 'B', holdSeconds: 20, bothSides: false, rounds: 1),
+        ]),
+      );
+
+      expect(segments.map(_describe), [
+        'getReady 5s',
+        'hold A left r1',
+        'switchSides 5s',
+        'hold A right r1',
+        'nextRound 5s',
+        'hold A left r2',
+        'switchSides 5s',
+        'hold A right r2',
+        'nextExercise 5s',
+        'hold B r1',
+      ]);
+    });
+
+    test('a pause of 0 s means no Transitions at all', () {
+      final segments = buildSegments(
+        _plan(Mode.stretching, const [
+          StretchingStep(exerciseId: 'A', holdSeconds: 30, bothSides: true, rounds: 1),
+        ], transition: 0),
+      );
+
+      expect(segments.map(_describe), ['hold A left r1', 'hold A right r1']);
+    });
+  });
+
+  group('Workout', () {
+    test('each set is followed by a Rest, except the very last', () {
+      final segments = buildSegments(
+        _plan(Mode.workout, const [
+          WorkoutStep(exerciseId: 'A', sets: 2, target: WorkoutTarget.reps(10)),
+          WorkoutStep(exerciseId: 'B', sets: 1, target: WorkoutTarget.seconds(30)),
+        ]),
+      );
+
+      expect(segments.map(_describe), ['set A 1', 'rest', 'set A 2', 'rest', 'set B 1']);
+    });
+
+    test('a Superset alternates its members and rests after each round only', () {
+      final segments = buildSegments(
+        _plan(Mode.workout, const [
+          Superset(
+            sets: 2,
+            restBetween: false,
+            members: [
+              SupersetMember(exerciseId: 'A', target: WorkoutTarget.reps(10)),
+              SupersetMember(exerciseId: 'B', target: WorkoutTarget.reps(12)),
+            ],
+          ),
+        ]),
+      );
+
+      expect(segments.map(_describe), ['set A 1', 'set B 1', 'rest', 'set A 2', 'set B 2']);
+    });
+
+    test('with rest between, a Superset also rests between its members', () {
+      final segments = buildSegments(
+        _plan(Mode.workout, const [
+          Superset(
+            sets: 1,
+            restBetween: true,
+            members: [
+              SupersetMember(exerciseId: 'A', target: WorkoutTarget.reps(10)),
+              SupersetMember(exerciseId: 'B', target: WorkoutTarget.reps(12)),
+            ],
+          ),
+        ]),
+      );
+
+      expect(segments.map(_describe), ['set A 1', 'rest', 'set B 1']);
+    });
+
+    test('a set carries its target, weight and position in the Step', () {
+      final set =
+          buildSegments(
+                _plan(Mode.workout, const [
+                  WorkoutStep(exerciseId: 'A', sets: 3, target: WorkoutTarget.reps(8), weightKg: 40),
+                ]),
+              )[2]
+              as SetSegment;
+
+      expect(set.target, const WorkoutTarget.reps(8));
+      expect(set.weightKg, 40);
+      expect((set.set, set.sets), (2, 3));
+    });
+  });
+}

test/player/session_runner_test.dart

@@ -0,0 +1,158 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:zenxercise/src/modes/mode.dart';
+import 'package:zenxercise/src/plans/models/plan.dart';
+import 'package:zenxercise/src/player/segments.dart';
+import 'package:zenxercise/src/player/session_runner.dart';
+
+Plan _plan(Mode mode, List<PlanItem> items, {int transition = 5}) => Plan(
+  id: 'p',
+  mode: mode,
+  name: 'Plan',
+  items: items,
+  transitionSeconds: transition,
+  createdAt: DateTime(2026),
+  updatedAt: DateTime(2026),
+);
+
+final t0 = DateTime(2026, 10, 29, 7);
+DateTime at(int seconds) => t0.add(Duration(seconds: seconds));
+
+void main() {
+  group('Stretching runs by itself', () {
+    late SessionRunner runner;
+    var cues = 0;
+
+    setUp(() {
+      cues = 0;
+      runner = SessionRunner(
+        _plan(Mode.stretching, const [StretchingStep(exerciseId: 'A', holdSeconds: 30, bothSides: true, rounds: 1)]),
+        startedAt: t0,
+        onCue: () => cues++,
+      );
+    });
+
+    test('counting down a get-ready, two holds and the switch between them', () {
+      expect(runner.current, isA<TransitionSegment>());
+      expect(runner.remaining(at(2)), const Duration(seconds: 3));
+
+      runner.tick(at(5));
+      expect(runner.current, isA<HoldSegment>().having((h) => h.side, 'side', Side.left));
+
+      runner.tick(at(35));
+      expect(runner.current, isA<TransitionSegment>().having((t) => t.kind, 'kind', TransitionKind.switchSides));
+
+      runner.tick(at(40));
+      runner.tick(at(70));
+      expect(runner.isFinished, isTrue);
+      expect(runner.isComplete, isTrue);
+      expect(cues, 4);
+    });
+
+    test('pausing stops the clock', () {
+      runner.tick(at(5));
+      runner.pause(at(10));
+      runner.tick(at(100));
+      expect(runner.current, isA<HoldSegment>());
+      expect(runner.remaining(at(100)), const Duration(seconds: 25));
+
+      runner.resume(at(100));
+      expect(runner.remaining(at(110)), const Duration(seconds: 15));
+    });
+
+    test('skipping and going back move between holds, passing over Transitions', () {
+      runner.skip(at(1));
+      expect(runner.current, isA<HoldSegment>().having((h) => h.side, 'side', Side.left));
+      runner.skip(at(2));
+      runner.skip(at(3));
+      expect(runner.current, isA<HoldSegment>().having((h) => h.side, 'side', Side.right));
+
+      runner.back(at(4));
+      expect(runner.current, isA<HoldSegment>().having((h) => h.side, 'side', Side.left));
+      expect(runner.remaining(at(4)), const Duration(seconds: 30));
+    });
+
+    test('there is progress worth saving only once a hold has ended', () {
+      expect(runner.hasProgress, isFalse);
+      runner.tick(at(5));
+      // Skipping the left side is not progress; the right side starts after its switch at 15 s.
+      runner.skip(at(10));
+      runner.tick(at(15));
+      expect(runner.hasProgress, isFalse);
+      runner.tick(at(45));
+      expect(runner.hasProgress, isTrue);
+    });
+
+    test('ending early finishes incomplete', () {
+      runner.end(at(12));
+
+      expect(runner.isFinished, isTrue);
+      expect(runner.isComplete, isFalse);
+      expect(runner.result(at(12)).duration, const Duration(seconds: 12));
+    });
+  });
+
+  group('Workout runs at the user\'s pace', () {
+    final plan = _plan(Mode.workout, const [
+      WorkoutStep(exerciseId: 'Squat', sets: 2, target: WorkoutTarget.reps(10), weightKg: 60),
+      WorkoutStep(exerciseId: 'Plank', sets: 1, target: WorkoutTarget.seconds(30)),
+    ]);
+
+    test('a rep set waits for "Set done", then the Rest counts up until the next set starts', () {
+      final runner = SessionRunner(plan, startedAt: t0);
+
+      runner.tick(at(600));
+      expect(runner.current, isA<SetSegment>());
+
+      runner.completeSet(reps: 8, weightKg: 62.5, now: at(40));
+      expect(runner.hasProgress, isTrue);
+      expect(runner.current, isA<RestSegment>());
+      expect(runner.elapsed(at(112)), const Duration(seconds: 72));
+
+      runner.startNext(at(120));
+      expect(runner.current, isA<SetSegment>().having((s) => s.set, 'set', 2));
+    });
+
+    test('a timed set starts on demand, counts down and logs itself', () {
+      var cues = 0;
+      final runner = SessionRunner(plan, startedAt: t0, onCue: () => cues++);
+      runner.completeSet(reps: 10, weightKg: 60, now: at(30));
+      runner.startNext(at(90));
+      runner.completeSet(reps: 10, weightKg: 60, now: at(120));
+      runner.startNext(at(180));
+
+      expect(runner.isWaitingToStart, isTrue);
+      runner.tick(at(500));
+      expect(runner.current, isA<SetSegment>());
+
+      runner.startTimer(at(500));
+      runner.tick(at(530));
+
+      expect(runner.isFinished, isTrue);
+      expect(cues, 1);
+      expect(runner.result(at(530)).setLogs.map((l) => (l.exerciseId, l.set, l.reps, l.seconds, l.weightKg)), [
+        ('Squat', 1, 10, null, 60.0),
+        ('Squat', 2, 10, null, 60.0),
+        ('Plank', 1, null, 30, null),
+      ]);
+    });
+
+    test('redoing a set after going back replaces its log', () {
+      final runner = SessionRunner(plan, startedAt: t0);
+      runner.completeSet(reps: 6, weightKg: 60, now: at(30));
+
+      runner.back(at(40));
+      runner.completeSet(reps: 10, weightKg: 60, now: at(60));
+
+      expect(runner.result(at(60)).setLogs.single.reps, 10);
+    });
+
+    test('a skipped set is not logged', () {
+      final runner = SessionRunner(plan, startedAt: t0);
+      runner.skip(at(10));
+      runner.skip(at(11));
+
+      expect(runner.current, isA<SetSegment>().having((s) => s.set, 'set', 2));
+      expect(runner.result(at(11)).setLogs, isEmpty);
+    });
+  });
+}

test/support/test_app.dart

@@ -6,7 +6,9 @@ import 'package:zenxercise/src/app.dart';
 import 'package:zenxercise/src/exercises/exercise.dart';
 import 'package:zenxercise/src/exercises/exercise_library.dart';
 import 'package:zenxercise/src/modes/mode.dart';
+import 'package:zenxercise/src/history/session_repository.dart';
 import 'package:zenxercise/src/plans/plan_repository.dart';
+import 'package:zenxercise/src/player/player_effects.dart';
 import 'package:zenxercise/src/settings/settings_controller.dart';
 
 import 'test_database.dart';
@@ -48,6 +50,18 @@ final sampleLibrary = ExerciseLibrary([
   exercise('Barbell_Squat', Mode.workout, primary: const ['quadriceps'], equipment: 'barbell'),
 ]);
 
+/// Counts chimes instead of playing them and leaves the screen alone.
+class FakePlayerEffects implements PlayerEffects {
+  final chimes = <Mode>[];
+  bool screenOn = false;
+
+  @override
+  Future<void> chime(Mode mode) async => chimes.add(mode);
+
+  @override
+  Future<void> keepScreenOn(bool on) async => screenOn = on;
+}
+
 /// A Pixel-sized screen instead of the default 800×600, so the floating
 /// navigation bar does not cover what a test taps.
 void usePhoneScreen(WidgetTester tester) {
@@ -62,6 +76,8 @@ Future<SettingsController> pumpApp(
   ExerciseLibrary? library,
   Map<String, Object> prefs = const {},
   PlanRepository? plans,
+  SessionRepository? sessions,
+  PlayerEffects? effects,
 }) async {
   SharedPreferences.setMockInitialValues(prefs);
   final settings = SettingsController(SettingsService());
@@ -74,6 +90,8 @@ Future<SettingsController> pumpApp(
         ChangeNotifierProvider.value(value: settings),
         Provider.value(value: library ?? sampleLibrary),
         Provider.value(value: plans ?? PlanRepository(db)),
+        Provider.value(value: sessions ?? SessionRepository(db)),
+        Provider<PlayerEffects>.value(value: effects ?? FakePlayerEffects()),
       ],
       child: const ZenXerciseApp(),
     ),

test/views/player_view_test.dart

@@ -0,0 +1,148 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:zenxercise/src/history/session_repository.dart';
+import 'package:zenxercise/src/modes/mode.dart';
+import 'package:zenxercise/src/plans/models/plan.dart';
+import 'package:zenxercise/src/plans/plan_repository.dart';
+import 'package:zenxercise/src/player/views/player_view.dart';
+
+import '../support/test_app.dart';
+import '../support/test_database.dart';
+
+void main() {
+  late PlanRepository plans;
+  late SessionRepository sessions;
+  late FakePlayerEffects effects;
+
+  setUp(() {
+    final db = testDatabase();
+    addTearDown(db.close);
+    plans = PlanRepository(db);
+    sessions = SessionRepository(db);
+    effects = FakePlayerEffects();
+  });
+
+  Future<void> startPlan(WidgetTester tester, Mode mode, List<PlanItem> items) async {
+    final plan = await plans.create(mode, 'Routine');
+    await plans.save(plan.copyWith(items: items));
+    usePhoneScreen(tester);
+    await pumpApp(tester, plans: plans, sessions: sessions, effects: effects, prefs: {'mode': mode.name});
+    await tester.tap(find.byTooltip('Start'));
+    await tester.pump();
+    await tester.pump();
+  }
+
+  /// Drift's streams need real time to deliver, outside the test's fake clock.
+  Future<List<Session>> sessionsOf(WidgetTester tester, Mode mode) async =>
+      (await tester.runAsync(() => sessions.watchSessions(mode).first))!;
+
+  /// The Player's ticker never lets frames settle, so it is pumped for a fixed time.
+  Future<void> settle(WidgetTester tester) async {
+    for (var i = 0; i < 8; i++) {
+      await tester.pump(const Duration(milliseconds: 100));
+    }
+  }
+
+  Future<void> wait(WidgetTester tester, int seconds) async {
+    for (var i = 0; i < seconds * 5; i++) {
+      await tester.pump(const Duration(milliseconds: 200));
+    }
+  }
+
+  testWidgets('a Stretching Session counts down, chimes, keeps the screen on and ends on its summary', (tester) async {
+    await startPlan(tester, Mode.stretching, const [
+      StretchingStep(exerciseId: 'Calf_Stretch', holdSeconds: 10, bothSides: false, rounds: 1),
+    ]);
+
+    expect(find.text('Get ready'), findsOneWidget);
+    expect(effects.screenOn, isTrue);
+
+    // After the get-ready and the 0.7 s crossfade into the hold.
+    await wait(tester, 5);
+    await settle(tester);
+    expect(find.text('Calf Stretch'), findsOneWidget);
+    expect(find.text('Get ready'), findsNothing);
+
+    await wait(tester, 10);
+    await settle(tester);
+
+    expect(find.text('Session complete'), findsOneWidget);
+    expect(effects.chimes, [Mode.stretching, Mode.stretching]);
+    expect(effects.screenOn, isFalse);
+    expect((await sessionsOf(tester, Mode.stretching)).single.complete, isTrue);
+  });
+
+  testWidgets('a Workout set is confirmed with its logged reps, then rested and repeated', (tester) async {
+    await startPlan(tester, Mode.workout, const [
+      WorkoutStep(exerciseId: 'Barbell_Squat', sets: 2, target: WorkoutTarget.reps(10), weightKg: 60),
+    ]);
+
+    expect(find.text('Set 1 of 2'), findsOneWidget);
+    expect(find.text('10 reps · 60 kg'), findsOneWidget);
+
+    await tester.tap(find.text('Set done'));
+    await settle(tester);
+    await tester.tap(find.byTooltip('Reps −'));
+    await tester.pump();
+    await tester.tap(find.text('Save set'));
+    await settle(tester);
+
+    expect(find.text('Rest'), findsOneWidget);
+    await wait(tester, 3);
+    expect(find.text('0:03'), findsOneWidget);
+
+    await tester.tap(find.text('Start next set'));
+    await settle(tester);
+    await tester.tap(find.text('Set done'));
+    await settle(tester);
+    await tester.tap(find.text('Save set'));
+    await settle(tester);
+
+    expect(find.text('Session complete'), findsOneWidget);
+    expect(find.text('Set 1 · 9 reps · 60 kg'), findsOneWidget);
+    expect(find.text('Set 2 · 10 reps · 60 kg'), findsOneWidget);
+  });
+
+  testWidgets('ending early after a set saves an unfinished Session', (tester) async {
+    await startPlan(tester, Mode.workout, const [
+      WorkoutStep(exerciseId: 'Barbell_Squat', sets: 3, target: WorkoutTarget.reps(10)),
+    ]);
+    await tester.tap(find.text('Set done'));
+    await settle(tester);
+    await tester.tap(find.text('Save set'));
+    await settle(tester);
+
+    await tester.tap(find.byTooltip('End session'));
+    await settle(tester);
+    await tester.tap(find.text('End session').last);
+    await settle(tester);
+
+    expect(find.text('Ended early'), findsOneWidget);
+    expect((await sessionsOf(tester, Mode.workout)).single.complete, isFalse);
+  });
+
+  testWidgets('skipping through everything leaves no Session behind', (tester) async {
+    await startPlan(tester, Mode.workout, const [
+      WorkoutStep(exerciseId: 'Barbell_Squat', sets: 1, target: WorkoutTarget.reps(10)),
+    ]);
+
+    await tester.tap(find.byTooltip('Skip'));
+    await settle(tester);
+
+    expect(find.byType(PlayerView), findsNothing);
+    expect(await sessionsOf(tester, Mode.workout), isEmpty);
+  });
+
+  testWidgets('ending before anything is done leaves no Session behind', (tester) async {
+    await startPlan(tester, Mode.workout, const [
+      WorkoutStep(exerciseId: 'Barbell_Squat', sets: 3, target: WorkoutTarget.reps(10)),
+    ]);
+
+    await tester.tap(find.byTooltip('End session'));
+    await settle(tester);
+    await tester.tap(find.text('End session').last);
+    await settle(tester);
+
+    expect(find.byType(PlayerView), findsNothing);
+    expect(await sessionsOf(tester, Mode.workout), isEmpty);
+  });
+}

tools/sounds/make_cues.py

@@ -0,0 +1,61 @@
+"""Synthesises the Player's two cue sounds into assets/sounds/ (standard library only).
+
+- stretching_cue.wav: a soft singing bowl, slow attack, long gentle decay.
+- workout_cue.wav: a short, muted wooden "tok".
+
+Both are kept quiet (peak about -12 dBFS) so they sit under the user's music.
+"""
+
+import math
+import random
+import struct
+import wave
+from pathlib import Path
+
+RATE = 22050
+
+
+def write(path: Path, samples: list[float]) -> None:
+    peak = max(abs(s) for s in samples) or 1.0
+    scale = 0.25 / peak  # about -12 dBFS
+    with wave.open(str(path), "wb") as out:
+        out.setnchannels(1)
+        out.setsampwidth(2)
+        out.setframerate(RATE)
+        out.writeframes(b"".join(struct.pack("<h", int(s * scale * 32767)) for s in samples))
+
+
+def singing_bowl(seconds: float = 2.6) -> list[float]:
+    # Inharmonic partials of a bowl, each fading at its own pace, with a slight beat.
+    partials = [(392.0, 1.0, 1.4), (393.2, 0.6, 1.5), (1062.0, 0.35, 0.8), (2010.0, 0.12, 0.45)]
+    samples = []
+    for n in range(int(seconds * RATE)):
+        t = n / RATE
+        attack = min(1.0, t / 0.04)
+        value = sum(a * math.exp(-t / decay) * math.sin(2 * math.pi * f * t) for f, a, decay in partials)
+        samples.append(attack * value)
+    return samples
+
+
+def wood_tok(seconds: float = 0.12) -> list[float]:
+    rng = random.Random(7)
+    samples = []
+    for n in range(int(seconds * RATE)):
+        t = n / RATE
+        body = math.exp(-t / 0.018) * (math.sin(2 * math.pi * 820 * t) + 0.4 * math.sin(2 * math.pi * 1640 * t))
+        click = math.exp(-t / 0.002) * (rng.random() * 2 - 1) * 0.3
+        samples.append(body + click)
+    return samples
+
+
+def main() -> None:
+    out = Path(__file__).resolve().parents[2] / "assets" / "sounds"
+    out.mkdir(parents=True, exist_ok=True)
+    write(out / "stretching_cue.wav", singing_bowl())
+    write(out / "workout_cue.wav", wood_tok())
+    for f in sorted(out.glob("*.wav")):
+        print(f"{f.name}: {f.stat().st_size / 1000:.0f} kB")
+
+
+if __name__ == "__main__":
+    main()