The io-Ball is one of the most popular exercise balls in the U.S.. Equinox fitness studios developed the extremely popular Pilates Remix with io-Ball class. Now, for the first time anywhere you can join the io-Ball online fitness community. Learn from and workout with the best io-Ball instructors throughout the world. Take classes at your convenience in the comfort of your own home. Your subscription gives you unlimited access to all our online workouts.