Description Disc shaped air cushion to reduce back pain & improve posture when sitting. The Wobble Cushion can also be used for standing & balancing exercises to help build ankle stength & core stability. 45cm diameter. When to use it Can be used any time you sit to straighten the back, prevent slouching & reduce back pain. Plus in the gym or at home to build ankle strength & core stability. Common Conditions Back pain Herniated disc Sciatica Lumbago Size 45cm diameter. How it Works Use the a pump to inflate the Wobble Cushion. Place the Wobble Cushion on your chair & sit on it. The unpredictable base of cushion forces the user to actively work the supporting muscles of the back to remain stable. This benefits posture, prevents slouching & stops prolonged stress on the structures of the lower back. Or by simply standing on the wobble cushion & doing simple exercise to build ankle strength & core stability. Please Note: Pump not included. The maximum weight for this product is 200kg, which is equivalent to 32 stone.