Meet the VIVE Wobble Cushion: another tool you can use to improve your posture and balance. It can also help you stabilize and tone your core muscles. The pad has a non-slip, textured surface. The balance disc measures 12.5″ when inflated. It can support up to 440lbs weight.
You can use this wobble cushion to target your leg and back muscles too. Costs under $20 at this time.