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SKLZ SpeedSac Sprint Trainer
Build explosive leg drive out of the blocks with the SpeedSac™. Variable weight sled allows you to strengthen your lower body muscles by resistance training similar to metal sleds. Removable weights allow you to adjust the towing resistance. You can also use the handles on the bags to perform various upper and lower body exercises such as lunges or front raises. Includes three durable weight bags that can be filled with up to ten pounds of sand (30 pounds total). Won’t harm grass or mar wood floor. Adjustable leash length to accommodate athletes of any size.