Best suited to users over 6ft (1.83m) tall, the Adidas core gym ball sized 75cm (30") will let you achieve improved overall stability and flexibility. The gym ball enhances the effects of such popular exercises as sit-ups, back exercises, stretching, balance and resistance work. By forcing you to maintain balance, the ball can help you strengthen core muscle groups. Manufactured from an anti-burst material, the ball has a partly structured surface for great stability and control. It is suitable for users who weight up to 110kg (243lbs) and supplied with a hand pump.