Great app
Simple to use. Easy to adjust difficulty depending on each users fitness level. Wish there was audio so I wouldnt have to keep straining to see the screen is my only critical feedback. Definitely worth using if you want to get a workout from your exercise ball and arent sure where to start or have been using it for a while and want something to help with routine or adding new challenges.
Jarethcrazy3 about
Stark Gym Ball, v2.4