Classic Balance Ball Chair with Workout DVD Welcome to the world of active sitting. This Balance Ball Chair can provide all-day ergonomic support for a stronger back. By sitting on the ball, you can improve your posture and spinal alignment while getting a powerful core-strengthening workout. The included DVD demonstrates principles of muscle control and core toning from pilates with deep breathing and easy-to-do yoga. That's how to maximize your work and workout time. What You Get Chair base 2 Chair backs 4 Casters 2 Knobs Inflatable ball Retention Rim Hardware Wrench Air pump Air pump nozzle Plug Instructions Exercise guide poster Workout DVD Good to Know Consult with your doctor before beginning this or any other exercise program. Perform exercises in a slow and controlled manner. Use only on smooth surfaces. Do not use if deep scratches or gouges exist. Stop and rest if you feel dizzy or short of breath.