The Set of Resistance Tubes have soft grip handles for uninterrupted training exercises. These blue colored tubes provide heavy resistance, ideal for strengthening exercises. Unlike weight and pulley devices and weight machines, the figure of eight tubes allow for all strengthening exercises to be done in functional, sports related movements. This makes them perfect not only for people with injuries but for sports training. Resistance Tube work Depending on their level of elasticity, they provide a graded amount of resistance to movement. They provide an excellent method of resistance training for the strengthening of specific muscles and tendons.