Encourage good posture and strengthen your core with the Health Mark Swiss Ball Chair. Ideal for the home or office, this ball chair incorporates a stabilizing base with locking wheels and a large exercise ball that can also be used independently. Use the base to stabilize the ball as an ergonomic chair when you"re working at your desk or watching TV. Sitting on the ball relieves pressure on your shoulders and forces your core muscles to work to keep you upright. You can also remove the exercise ball from the base and use it for toning exercises like back bends and crunches. Your sore shoulders will thank you.