Reset activity on watch

1. Open the Health app on your iPhone.

2. Tap the profile icon on the top-right, and on the next screen, select Apps, under Privacy.

3. On the Apps page, select Health.

4. Now, if you want to delete all of the data at once, tap on the Delete All Data from Health button.

However, once you tap on Delete All Data from Health, all your data related to that particular app will be deleted at once. And, since the process is irreversible, you cannot retrieve the data back again.

Hey there,

To reset the fitness calibration data (for recording workouts and activity):

1. Enter the Watch app on your iPhone.
2. Scroll down and tap on the Privacy tab.
3. Tap Reset Fitness Calibration Data.

This will reset how your watch records your activity and your workouts.

Grey360

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Reset "Activity" apps data in App… - Apple Community