While our app is currently only able to sync directly with Apple Health and Google Fit, there are third-party apps that help you sync your activity tracker data (e.g. Fitbit) with Apple Health such as Fitbit to Apple Health Sync and Power Sync for Fitbit (+ more)
How this works: when you install one of the sync apps linked above, your Fitbit or smart watch will then track your activity as usual and then automatically send it to the third party app. That app will then forward the activity measurements to Apple Health, allowing them to appear in the app where you can get rewards for them!
Note: you do not need to do this to connect to Apple Watch as it is native to Apple Health.
Have an Android device? Check out this article for how to connect to Google Fit instead.