Exclusive! Develop optimum speed, power, and strength for any sport through functional resistance. The specialized rope-and-pulley system of this unique device generates a smooth and constant pull during sprint or plyometric drills. An integrated adjustment knob lets you set the resistance level from 4 lbs. to 1,000 lbs. and a 120' cotton rope gives plenty of length to perform true training runs. Set up is simple: secure the unit to a stationary object like a fence or goal post, attach the harness, and begin training. Aluminum construction with rubber roller. Includes nylon harness and instructional training DVD by Tom Shaw. Medium fits up to 44" chest; Large fits up to 56" chest. 7 lbs.