Fitness App stuck on loading screen

Currently having problem with my Fitness App, which is stuck on loading screen (screenshot attached below).

Several workarounds I've tried but didn't work:

• unpair my apple watch 5 from my iphone. then re-pair it.
• reset > erase all content and settings. then remove Fitness app from my iphone. then re-pair it (for the 2nd time). then install Fitness app from appstore.
• make sure to sign in with the correct account.
• restart my iphone