Exercise Ball - Anti Burst - Balance & Stability Ball To Help With Fitness Workout - For Pilates, Core, Tone and Ab - Free Pump HEAVY DUTY EXERCISE BALL - Fitness 360 is meticulously made of professional grade Anti-Burst , Anti-Slip, Phthalate Free Material, providing athletes with the ultimate support and durability. ACCELERATE YOUR CORE WORKOUT - Fitness 360 is perfect for Athletes - Men - Women looking to gain killer 6-pack abs, strengthen the abdominal, thigh muscles, fix back problems and gain a more functional core. PERFECT FOR EVERYONE - Fitness 360 comes with size options of 55cm (5' 6" and under), 65cm (5'6" to 6' tall) and 75cm (6' or taller). It can be used at the gym, work office or classroom as substitute desk chair to maximise your workout and AB training performance.