Your Apple Watch is compatible! Check out how do I connect my Apple Watch to Fiit.
Your Fitbit and other Garmins are not compatible — you can wear these devices but your performance won’t be tracked in Fiit.
Fiit is also compatible with 25 other fitness trackers (and counting!).
If you want to track reps during strength training classes, you'll need the Fiit device which counts reps, as well as heart rate and calorie burn. Heart rate-only fitness trackers do not track reps.