1. Upgrade material: made of environmental foam, and tube is made of TPE rubber, which is y to the body. From 2pcs upgrade 4pcs pull ropes tube pedal fitness ropes, high tensile strength and good elasticity than 2pcs ropes. and comfortable. 2. Fitness shape your body: multi function tension rope pedal, use sit up pedal you can workout your stomach/waist/legs, arms/hips/thighs at the same time. Resistance bands for exercise help you rehabilitative exercises, fat loss, building muscle. Perfect for professional sports or beginners, young men and women. 3. exercise: workout in the privacy of your home, gym room, office, or even outdoors. Workouts for arms, legs and back, and can do seated exercises. Improves stretching and flexibility, strong pulling force, slimming effect is significant. 4. Versatile in use: upgrade exercise band a superior band product for resistance training and rehabilitation, stretches tones and conditions all major muscle groups. Ideal for assisting in sports athletes, physical therapy, rehabilitation, bodybuilding, yoga, boxing, and so on. Simple yet effective workouts will increase strength improve motion.