This Fitness First anti-burst ball is made from a strong material that holds up to 2000 pounds and deflates slowly if punctured, minimizing the risk of injury. Use the ball to strengthen and tone your abs, back, or glutes in a whole new way thanks to the resistance from multiple directions. It's great for people of all ages and fitness levels. For optimal performance, it may be necessary to re-inflate your new Balance Ball once or twice after the initial inflation, to make PVC material gets fully stretched is the key. This premium exercise ball makes working out more effective. Use it for maternity, yoga, seating, Pilates, stretching and more. Strong anti-burst material. Strengthen abs, back, and glutes.