Fitness data from treadmill

Hello notforpublic,

Thanks for choosing the Apple Support Communities. This would depend on the manufacturer of the Treadmill and if they provide support for Apple Watch. If it is compatible, try following these steps: Use gym equipment with Apple Watch - Apple Support

"Pair your Apple Watch with gym equipment

1. Check if the equipment is compatible—youʼll see “Connects to Apple Watch” or “Connect to Apple Watch” on the equipment.
2. Make sure your watch is set to detect gym equipment—open the Settings app  on your Apple Watch, tap Workout, then turn on Detect Gym Equipment.
3. Hold your Apple Watch within a few centimeters of the contactless reader on the gym equipment, with the display facing the reader.
4. A gentle tap and beep confirm that your Apple Watch is paired.

If Detect Gym Equipment is off in Settings on your Apple Watch, open the Workout app , then hold your Apple Watch near the contactless reader on the gym equipment, with the display facing the reader.

Start and end a workout

Press Start on the gym equipment to begin. Press Stop on the equipment to end the workout.

When you end your workout, data from the equipment appears in the workout summary in the Activity app on your Apple Watch and the Fitness app on iPhone."

We hope this helps.

Cheers!