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SPEEDSTER® POWER RUNNER WITH ULTRA HEAVY RESISTANCE CORDS- The Power Runner develops high knee action and promotes balance. As the athlete runs away from the anchor point the Lightning Cord tightens forcing the player to exert more strength to keep the cord stretched. Perform explosive running drills without compromising technique. POWER RUNNER TRAINING PACKAGE INCLUDES: 2 - Padded Adjustable Ankle Cuffs with Quick Release Snaps, 2 - 4ft Lightning Cords with Nylon Safety Sleeve TechnologyTM (Stretches up to 12ft), 1 -Anchor Strap. WHICH RESISTANCE IS RIGHT FOR YOU? Medium- Athletes 140lbs or less, Heavy- Athletes over 140lbs, Ultra Heavy- Athletes over 180lbs. RESISTANCE OVERSPEED POUNDAGE CHART: Medium- 26lbs, Heavy- 38lbs, Ultra Heavy- 55lbs NOTICE: We do not recommend running away from these cords in the same manner you would using a weighted sled for resistance training. They are for overspeed and skill training drills. Made with the highest quality premium rubber completely covered with a durable and protective nylon sleeve to stand up to the rigorous demands of professional and residential use. The NEW Generation of Resistance Cords! WORLDWIDE FITNESS PRODUCTS: The principal of this company has been manufacturing, selling and distributing fitness and sports training products for over 20 years. COMPANY MISSION STATEMENT: To offer high quality products and services at a fair price!