fitbit import
Fitbit Import is an easy to use and nicely designed app that flawlessly import your Apple health data to Fitbit. Now you can have your Apple Watch data or other data from different none Fitbit devices to your Fitbit account.
Currently the app supports syncing of all kinds of workouts, weight and body fat percentage. You can choose and configure which type of data is imported to Fitbit. The app also can do all the syncing in the background without much action from you.