You can have your FulGaz activities to automatically sync with your Apple Health app, but it is not a direct connection and requires a couple of "in-between" steps that need to be undertaken first.
If you would like to use your FulGaz activities to contribute to "closing your rings" on Apple Health, you will need a Strava account (the free version is fine). Once you have signed up, link your FulGaz and Strava accounts. You can do this from within the FulGaz app or on the FulGaz Member's Page under Preferences.
Then you will need to connect Strava to your Apple Health account. In your Apple Health app, go to Your Details, then Apps, then Strava. Turn on the data types you would like to be added.
Once these accounts are connected and your FulGaz rides are being automatically uploaded, Strava will send all your FulGaz rides (and other selected activity types) directly to Apple Health!
Using your Apple Watch as a Heart Rate monitor: FulGaz can't communicate directly with your Apple watch so at this time it is not possible to use it as a heart rate monitor. While this is not likely to change in the short term, our team will be looking into it for future development.