Activity app on watch going crazy

Hi

Whilst I can't say why that has happened, the following steps may help to stop erroneous data from being recorded:

If you are sharing an Apple ID with another user, then stop doing so.

• For Activity tracking and reporting and various other features and services to work as intended, each person should each have a separate Apple ID and be signed in accordingly on their own devices.

If you have not yet done so, update your iPhone and Apple Watch with any available software updates, starting with your iPhone (begin by making a backup):

• Update the iOS on your iPhone, iPad, or iPod touch - Apple Support
• Update your Apple Watch - Apple Support

Check your Health settings:

• On your iPhone, in the Watch app, go to: My Watch (tab) > Health.
• Check that your personal information is accurate.
• If the setting for Wheelchair currently states "Not Set", then change it to "Yes" or "No" as appropriate.

If you have ever previously (not necessarily recently) used any third-party fitness tracking, sleep tracking or heart rate monitoring apps, check whether there is an active or paused session within any of them.

• If there is, then end that session from within that app on your Apple Watch.
• If in doubt, it may help to remove any such third-party apps from your Apple Watch, at least temporarily.

Close certain apps and then restart (normally) both your iPhone and your Apple Watch:

• Close the Watch app, Activity app and Health app (if open) on your iPhone:
  • Double-click the Home button, then swipe up on each app preview to close the apps.
• Turn both devices off together, then restart your iPhone first:
  • Restart your iPhone, iPad, or iPod touch - Apple Support
  • Restart your Apple Watch - Apple Support

If the issue persists, then t may help to unpair and re-pair your Apple Watch:

• The Watch app on your iPhone takes a backup of your watch automatically when unpairing via the app.
• Initially choose to Restore from Backup during set up (most data and settings will be restored, with some exceptions, such as Apple Pay cards, passcode).
• If the issue occurs again, consider instead unpairing and setting it up as a new watch.
• Unpair your Apple Watch and iPhone - Apple Support
• Set up your Apple Watch - Apple Support

If the issue still persists, then I suggest that you contact Apple Support (remote diagnostics and/or mail-in service may be available, if required), make a Genius Bar reservation or visit an Apple Authorised Service Provider for assistance:

• US: Apple Watch Service Answer Center - Apple Support
• Elsewhere: Apple - Support

Perhaps restarting your watch will make it less activity zealous!

Restart your Apple Watch

1. Press and hold the side button until you see the Power Off slider.
2. Drag the slider to turn off your device.
3. After your watch turns off, press and hold the side button again until you see the Apple logo.

If your Apple Watch is charging, take it off the charger first. When your watch is charging, you can't restart it.

The only thing that I haven't tried going to the genus bar but i doubt that this would solve anything since the same problem appears to be effecting friends I have with both series 2 & 3 watches .. restarting..repairing have no effect whatsoever and I we are all running watchOS 4.2

Mine is giving me Move & Exercise credit when I set it to OPEN GOAL and do nothing but sit and watch TV. I tried restarting it that did nothing to fix it.

You're welcome - best of luck! 🙂