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Watch sessions now run an HKLiveWorkoutBuilder: heart rate and active energy are collected live (shown in an in-workout HUD), saved to Health as a real HKWorkout on completion, and carried back to the phone as WorkoutMetrics on the workout document. Phone-only workouts get an estimated Health workout (MET x bodyweight x duration) after a 10s debounce that a late-arriving watch session cancels; a launch sweep backfills workouts completed within the last day. Dedupe is keyed on metrics.healthKitWorkoutUUID plus the metrics source. Splits gain an activity type (strength, functional, HIIT, core, cardio, cycling) that categorizes the Health workout and picks the MET value. A post-workout summary sheet (duration, calories, avg/max HR, HR zones, total volume) fills in live and is also shown on completed workouts. Weights can now display in lb or kg (display-only relabel), synced to the watch over the existing application context. WorkoutDocument schema 1->2 (metrics are irreplaceable, so older apps must quarantine rather than strip them); cache schema 2 rebuilds the SwiftData store with the new metric columns. Deleting a workout in the app intentionally leaves its Health record in place.
Workouts
A workout tracking app for iPhone and Apple Watch. Build workout splits, run sessions, and track your progress — with your data stored as plain JSON files in your own iCloud Drive.
Key Features
- Workout splits — organize exercises into reusable routines with custom colors, icons, and an activity type (strength, HIIT, cardio, …). Start with built-in starter splits (Upper Body / Core / Lower Body) generated from a bundled exercise catalog.
- Exercise library — a bundled catalog of starter exercises (bodyweight and machine-based) to populate your splits.
- Run a workout — start a session from a split, then tap an exercise to run it as a paged flow: a Ready? lead-in, count-up work phases, count-down rests, and a Finish page — mirroring the Apple Watch. Swipe a row to mark it complete, or swipe to edit its plan (sets/reps/weight or duration) and notes. End a workout early from the ⋯ menu — Save keeps your progress (remaining exercises are marked skipped) or Discard removes it.
- Progress tracking — weight-progression charts per exercise across past sessions.
- Apple Watch companion — starting a workout on the iPhone launches the watch app straight into it. The watch lists your in-progress workouts; pick one, pick an exercise, and run it as a paged flow: a Ready? lead-in, count-up work phases, count-down rests with final-three-second haptics and auto-advance, and a Finish page with One More and a Done that auto-completes after a countdown. A phase-dot row (purple work, teal rest) tracks progress. Rest time and the auto-finish countdown are configurable; changes sync back to the phone.
- Two-way live run — prop your iPhone up during an Apple Watch workout and it runs the same Ready → work/rest → Finish flow with live timers, in step with the watch. It's bidirectional: drive from either device — swipe ahead, finish a set, add one — and the other follows. Only human transitions are sent; automatic ones (a rest timer ending) advance both devices independently off shared start times, so they never fight.
- Watch face complication — a launcher complication you can place on any Apple Watch face; tap it to open the app. Available in the circular, corner, inline, and rectangular accessory slots.
- Apple Health & Activity rings — completed workouts are saved to Apple Health and credit your Move and Exercise rings: recorded live on the Apple Watch (heart rate + active energy), or estimated on the iPhone when you train without your watch. See live heart rate and calories on the watch, and a post-workout summary (duration, calories, avg/max heart rate, heart-rate zones, total volume) you can revisit on any past workout. Weights display in your choice of pounds or kilograms.
- iCloud Drive sync — your data lives as human-readable JSON in your iCloud Drive, synced across devices and visible in the Files app. iCloud is required.
Architecture
iCloud Drive JSON documents are the sole source of truth; a local SwiftData
store is a rebuildable read-through cache populated exclusively by an
NSMetadataQuery observer (one-way flow: files → observer → cache). The phone is
the only device that touches iCloud Drive; the Apple Watch is a thin remote that
round-trips workout changes through the phone via WatchConnectivity.
See REQUIREMENTS.md for the data model and CLAUDE.md for project guidance.
Building
The Xcode project is generated with XcodeGen:
xcodegen generate
open Workouts.xcodeproj
Requires Xcode 26 (iOS 26 / watchOS 26, Swift 6).