Resetting calibration data does not remove any historic Activity or Health data. More information: Calibrating your Apple Watch for improved Workout and Activity accuracy - Apple Support
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.
Here are the steps to take: On your iPhone, open the Health app. Head to the Browse tab. Tap Activity. Scroll down to the Workouts section (or search for workout) From here, select Add Data in the
Launch the Activity app on your Apple Watch. Step 2. Swipe left to access the Sharing page. Step 3. Select the friend or family member from whom you want to hide your Activity rings from. Step 4
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