Use this exercise ball to strengthen your core muscles and improve your balance by increasing your stability. It can even be used as a replacement for a chair to improve your posture and help relieve back pain. Having Anti-Burst properties is very important, the ball will very slowly deflate if it gets punctured, rather than a big \'POP\' which could cause a risk of injury, particularly if being used in pregnancy. The ball can also be deflated for storage. Improves Balance Engages Core Push Pin Valve Anti Burst High Quality Material Ribbed Sides Provide Grip Great for Upper and Lower Body Exercise Easy to Inflate (Pump Included) Inflates to 65cm Weight Limit 250kg (over 39 Stone!)