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Background Cycle connects to any FTMS-compatible smart trainer over Bluetooth and runs structured interval workouts at specified wattage — both as relative FTP targets and absolute watts. Power, cadence, and speed stream live; workouts sync to Apple Health; and the current interval lives in the Dynamic Island while you ride.
Highlights
- ERG mode over Bluetooth FTMS — the trainer adjusts resistance automatically to hold target power.
- Pre-built workouts — FTP ramp test, Sweet Spot, VO2 Max, Sprint Intervals, Aerobic Endurance, Tabata, and a Pyramid.
- Relative or absolute power — intervals can be set in absolute watts or as a multiplier of your FTP.
- Apple Health integration — full workout session plus power samples every 5 seconds.
- Apple Watch companion — start, pause, and navigate intervals without touching the phone; live metrics on your wrist.
- Live Activity in the Dynamic Island and on the lock screen throughout the workout.
