OTG 85cm Anti-Burst Gym Ball
No matter what your fitness level this anti-burst gym ball is the right choice for you. It will help you tone and strengthen your deep pelvic and lower back muscles. It is also one of the best ways to get a great ab workout. The gym ball is a fantastic way to increase your smaller stability muscles, giving you better posture and balance. The ball itself is eighty-five (85) centimeters in diameter, but can easily be deflated for storage or travel.