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It trains your entire body with a combination of variable resistance bodyweight training and instability, builds core strength, shapes your legs, hips and you can get a stronger core to support your whole body. The product is made of natural latex, with good elasticity, resistance value of 20LB, can be stretched more than 10,000 times, and long-term use is not easy to deformation. It is wrapped by nylon material externally, which increases the feel of the hand and also plays a role in protecting athletes and latex tube.