To troubleshoot possible issues with syncing to and from Apple Watch, do the following:
* On your iPhone open Apple Health and go to Sharing → Apps → Hiiro. Turn ON all Read and Write permissions.. Check if Hiiro has all the permissions listed.
* Ensure the workout was saved on the Watch.
* Ensure the workout was saved to Apple Health or Apple Workouts on your iPhone.
* Open Hiiro and pull to refresh on Home tab.
* On your iPhone open Apple Health and go to Sharing → Apps → Hiiro. Disable all the permissions listed and enable them again.
* Restart iPhone and Apple Watch.