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this kind of product was made by superior material, no poison and no harm to your body. strength adjustable to help fat burning and muscle growing. 4.ems hip trainer can help you lift, shape and firm your hips and buttocks, let you have and charming body. muscle is composed of very fine muscle fibers, can be roughly divided into fast and slow.fast developed more easily, need to exercise to get tight fit.but in general exercise, fast must by high intensity anaerobic exercise to exercise effect..syi