Chute opens as running begins. perfect for adding resistance while running. Increase speed, strength, stamina and endurance. Adjustable waist belt with velcro enclosure. Using a running chute can help to increase your sprinting speed. It does so by making various muscles such as the glutes, quadriceps, hamstrings and calves contract with more intensity and reactivity. By enhancing the boost you feel during the sprinting, you can take yourself closer to the finishing line