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.