ZenXercise/GLOSSARY.md

# ZenXercise

An offline Android app for stretching and working out, split into two fully separate Modes. The user
builds their own Plans from a large built-in Exercise Library and performs them in a guided Player.

## Modes

**Mode**:
One of the two top-level app states, **Stretching** or **Workout**. Switching Mode changes the whole
app: design, Exercise Library, Plans and History. The last-used Mode is remembered.
_Avoid_: Tab, section, category

**Stretching Mode**:
The calm Mode: light design, lavender and violet, rounded shapes, slow transitions.

**Workout Mode**:
The energetic Mode: dark design, orange/red on near-black, bold type, snappy transitions.

## Exercises

**Exercise**:
A single movement from the Exercise Library, with name, Instructions, primary and secondary muscles,
equipment, level and a start and end image. Belongs to exactly one Mode. Users cannot create their own.
_Avoid_: Move, drill, activity

**Exercise Library**:
The read-only catalogue of Exercises bundled with the app, sourced from free-exercise-db (876
Exercises). Category `stretching` belongs to Stretching Mode (123); every other category to Workout
Mode (753). Browsed with text search and filters for muscle, equipment and level.
_Avoid_: Catalogue, database

**Flip Animation**:
Alternating an Exercise's start and end image about once a second, the v1 stand-in for real animation.

## Plans

**Plan**:
A user-created, ordered list of Steps (and Supersets) belonging to one Mode. The app ships no Plans.
_Avoid_: Routine, program, workout

**Step**:
One Exercise inside a Plan, with Mode-specific parameters:
- *Workout Step*: number of sets; reps **or** duration; optional target weight (kg).
- *Stretching Step*: hold duration; both-sides flag (left, then right); rounds.
_Avoid_: Item, entry

**Superset**:
Two or more adjacent Workout Steps grouped so they are performed alternately (A1 → B1 → A2 → B2 …).
It has one set count; each Step keeps its own reps or duration and weight. Rest between its Exercises
within a round is optional; the Rest Screen always follows the end of a round.
_Avoid_: Circuit, combo

**Rest Screen**:
In Workout Mode, the screen after "Set done": a count-up timer ("Resting 1:12") and a "Start next set"
button. Nothing counts down. Timed sets start only when the user taps Start.

**Transition**:
In Stretching Mode, a short card before the first hold ("Get ready") and between rounds, sides
("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** (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**:
The guided, one-Exercise-at-a-time screen used to perform a Session. It shows a large countdown ring,
pulses the Mode's accent colour in the last three seconds, shows full-screen "next" cards, advances
automatically when a timer ends and keeps the screen awake. A single soft chime (singing bowl in
Stretching, muted "tok" in Workout) plays only when a timer ends or something new starts; it mixes
with the user's music and can be muted. No ticking, no vibration.

**Set Log**:
The reps and weight actually done for one Workout set, prefilled from the Step's targets and confirmed
with "Set done".

**History**:
The per-Mode list of Sessions with date, Plan, duration and Set Logs.

**Streak**:
A single, subtle, Duolingo-style daily streak shared by both Modes: consecutive days with at least one
complete Session in either Mode, however short. Incomplete Sessions do not count. Shown as a small 🔥
and count in the top bar (grey until today is done); tapping it opens current/longest Streak and a
month calendar. Protected by Streak Freezes and the Grace Hour.

**Streak Day**:
The day a complete Session counts for. Normally its calendar day, except during the Grace Hour.

**Grace Hour**:
00:00–01:00. A Session completed then counts for the previous day if that day has no complete Session
yet; otherwise it counts for the current day.

**Streak Freeze**:
A saved token that is used automatically to cover a missed day so the Streak survives. One is earned
per 7 consecutive Streak Days; at most 2 are held. A frozen day shows ❄️ in the calendar. Missing more
days than Freezes held resets the Streak to 0.

**Reminder**:
A local notification sent only if no complete Session exists for that day. Two by default (19:00 and
22:30); each can be switched on/off and moved in Settings. No more than two. Android may deliver one up
to about an hour late (see docs/adr/0006).