Version: ø 55 cm, red. Gymnic Fitness Ball Sit n Gym - The sitting ball with feet. The Gymnic Fitness Ball Sit n Gym is simply brilliant. This exercise ball has been specifically designed to avoid the one-sided sitting position on chairs. To prevent the ball from rolling away when getting up, it is equipped with 6 small feet. Therefore, the fitness ball is ideal as a counterbalance to conventional office chairs and benches. It is also very popular for the trend sport Beach Jumping. Product details: Load capacity: max. 300 kg, Ball type: sitting ball, large exercise ball, Application area: rehabilitation, therapy, Diameter: 55 cm, Color: red.