StillCool Running Speed Training, 56 inch Speed Drills Resistance Parachute Running Sprint Chute Soccer Football Sport Speed Training 56" diameter, it can provide 25-35 lbs of resistance Experiments show that the speed increases, the resistance provided by the resistance parachute increasing. Withe drag chute, you can do strength training and speed training at the same time. Through this exercise, can improve the ability of the user's acceleration, muscle endurance, and enhance the ability to adjust the direction of the high-speed running. You can tie two or more resistance parachute to improve sport effect. Fully functional unit includes parachute and belt with velcro closure,Easily folds down to fit in the carrying bag included.