Support
What you need
- An iPhone running iOS 17 or later.
- A power source for workouts with power targets: a smart trainer, pedals, a crank or hub power meter, or a studio bike that broadcasts power. A workout written by heart rate needs only a heart-rate monitor.
- A heart-rate strap, or a watch that broadcasts heart rate over Bluetooth.
- Optional: a speed and cadence sensor, a running footpod, a core-temperature sensor, a muscle-oxygen sensor.
Connecting sensors
Wake each sensor first — turn the pedals, put the strap on — then scan on the Devices tab. The list shows fitness sensors first, strongest signal at the top; other Bluetooth devices sit under their own heading. In a room of identical bikes, the strongest signal is usually the one you are sitting on.
A sensor that is connected but sends nothing for 15 seconds is reconnected once automatically; if it stays silent, the Devices tab says so. Watches connected to another app on the phone sometimes need this.
Smart trainers
In ERG mode the trainer holds the workout's target power. A low-cadence stall lowers the target for a moment so you can recover. On a heart-rate step the trainer holds watts you set with the −5 W and +5 W buttons, or follows your heart rate automatically when Auto is on. In Target mode the trainer is not controlled and you hold the target yourself.
Your files
Every ride is saved on the phone and exported as a FIT file, a CSV file and a JSON archive, with a raw Bluetooth log. Share them from the ride's summary with AirDrop, Files or any app. The FIT file opens in Garmin Connect, Strava, intervals.icu and similar tools.
Something went wrong
Send the ride's raw log and CSV with a short description of what happened. The raw log holds every Bluetooth message, which is what makes sensor problems diagnosable.