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If circumstances do not permit the use of an exercise ball (for example, if your desk is too low or high to accommodate a ball that is the correct size for you), there are other options which allow for an active sitting surface. Some alternatives to using a ball chair are the Swopper and the Active Disc. Both of these products allow mobility and promote good posture. The Swopper is a stool-like piece of equipment that provides all of the same benefits of the ball due to its tilting and rocking motions. The Fitterfirst Active Disc is a cushion that you can put on a standard desk chair, allowing for movement through your hips so that your body to find its optimal posture in conjunction with gravity.