Trailhead Fitness App

## About Trailhead Trailhead is a workout tracking app built for people who train where there's no signal — trailheads, basement gyms, and remote climbing crags. ## Key Features 1. **Offline-first architecture** — every workout is written locally and synced when a connection returns 2. **Conflict resolution** — last-write-wins with a per-field merge strategy so a phone and tablet never overwrite each other 3. **Progress insights** — volume, PR tracking, and weekly load charts 4. **Custom program builder** — drag-and-drop mesocycle planning ## Engineering Notes The sync engine was the centerpiece. I used a local queue of intent-based mutations rather than raw state diffs, which made offline edits replay cleanly and cut sync conflicts to near zero. > "The only tracker I've used that just works when I'm out of service." — App Store review