Ideal for all-round core strength, this Morgan Sports 55cm gym & exercise ball is a great pick for improving balance, power and flexibility. Our Morgan Sports Exercise Gym Balls are great for improving posture and strengthening the body's flexibility. They can also help increase balance, especially in athletes who may suffer from stability problems due to their active lifestyle! Whether you use our exercise gym ball as an alternative seat or a training tool, it will help improve posture and strength. In addition, this exercise ball is made from tough, robust rubber which means it is tough enough to even withstand up to 125 kg of body weight.