Unlock all 12 fitness instructors for free by doing all the Instructor workout challenges! Go to the > 'Discover' tab and tap on > Instructor Challenges and start doing all the instructor workouts from the top down.
For example, if you want to unlock the 'Kung-Fu Master', do a workout with the 'Hippie' or 'Drill Sergeant' located above him and he will unlock. Plus, you'll unlock the next instructor workout challenges underneath.
There are now 6 new instructors to workout with, so as you go down the list completing instructor challenges, the more instructors you’ll uncover!