The exercise force is soft, which can effectively help the body stretch and avoid excessive impact on the muscles and Joints. *The contact between the body and yoga ball has massage effect, promote blood circulation through out the body. *Under a certain weight,the effect of muscle training can be achieved and the perfect body shape can be achieved. * In the process of practicing all parts of the body sre constantly being fine tuned persistent training can adjust people standing and sitting posture and make people behave dignified and generous. Specifications -=Product name:Yoga