Work your abs from almost any chair with a posture-improving inflatable Balance Disc. The Balance Disc engages your core muscles while sitting and can also be used for strengthening exercises in your chair or on the floor. By controlling the firmness of the cushion, you can adapt it to your fitness needs and sitting comfort.
Features one tactile side and one smooth side. Inflates with a standard pump. Can be deflated to 1" thickness, or inflated to 2" thickness13.8" (35-cm) diameter.