GYM Tracker.

Phase 0 — de-risking spikes

Set-Row Interaction Test →The core logging loop, instrumented. Log 4 fake sets between real sets and watch the tap counter + loop stopwatch. Target: unchanged set = 1 tap, loop ≤ 3s.iOS Rest-Timer Reality Check →Capability probes + a 30s wall-clock timer. Run once in Safari, then Add to Home Screen and repeat. The event log is the experiment record.