IBF Iron Body Fitness Pro Series Exercise Ball, Anti-Burst, Pump Included, Available in 55, 65, and 75 cmThe IBF Iron Body Fitness Pro Series exercise ball can be used to do a variety of exercises that will build muscle strength and flexibility. It also improves balance and coordination. The ball can be used as a chair for a passive workout to improve your posture and tone your body. The ball's anti-burst design means that it won't burst when punctured. Instead, it will slowly deflate. The included pump allows you to inflate and deflate the ball. Available in sizes 55, 65, and 75 cm.