Apple Watch
I lost all of my activity data on my watch and have no previous backups on my iPhone. Is there any other way i can retrieve my data
iPhone XR, iOS 15
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Your Health data is backed to iCloud by default so perhaps you can retrieve some of that from there.
If you sign in with the same Apple ID and make sure that Health option is enabled under iCloud, then wait some time for the sync to complete, hopefully that helps.
Manage Health data on your iPhone, iPod touch, or Apple Watch - Apple Support