Hello NutBikeNut,
To help resolve the issue with your Fitness app, follow the steps below:
- Restart the iPhone and Apple Watch: Restarting can refresh the connection and resolve unexpected issues
Restart your iPhone - Apple Support
Restart your Apple Watch - Apple Support
2. Make sure the iPhone and Apple Watch is up-to-date. Apple's updates contain software that is critical to the operation of your devices.
Update your iPhone or iPad - Apple Support
Update your Apple Watch - Apple Support
3. Delete the Fitness app and download it again.
Remove apps from iPhone - Apple Support
Download apps and games on your iPhone or iPad - Apple Support
Thanks for using the Apple Support Communities, and have a great day!