The viavito anti burst gym ball can be used for a huge array of exercises that strengthen the core upper and lower body muscle groups while also toning its great for sit ups back exercises stretching balance and resistance work you can even use it for free weights exercises as well made from tough anti burst pvc and with a max load of 200kg 31 stone this versatile gym ball is ideal for users of all shapes and sizes featuring a ribbed pattern for additional grip this gym ball is suit