Trouble after updating to iOS 14

After updating to iOS 14, watchOS 7, if the app cannot be started or data is missing, please try the following.

1. Reboot your Devices

Try restarting your iPhone and Apple Watch.

2. Check Record in Apple's Apps

Check your records with Apple's Fitness app and Health apps.

If you experience the above issues, follow the link below.
Apple Support:If you're missing Workout GPS routes or Health data after updating to iOS 14 and watchOS 7