Many people use an exercise ball at a desk instead of a chair. Active Sitting promotes core muscle use which can strengthen the back, help prevent fatigue and improve posture. But there�s nothing more annoying than having your ball roll away when you stand up. Now you can stop chasing your ball around the office with the NEW FitBALL� Holder. This inflatable ring holds one 65cm-75cm exercise ball and keeps the ball from rolling away when not in use.