Rampages yoga ball using high-grade imported PVC material, such as sponge like soft hand feeling, also have the spring like elastic, wheel like flexibility, smooth and comfortable, the sphere, the abdomen, back, waist and other parts, increase the body and limbs flexibility, toughness, promote the balanced development of the brain, promote the blood circulation, strengthen the heart and lung function, long-term use, simple exercise can effectively adjust your posture, you the perfect curve, reduces the backache backache.