SKLZ SpeedSac Trainer

Strengthen lower-body muscle groups to improve overall speed and explosiveness Easily adjusts for variable weight training 360 degree belt allows for multi-directional training Includes 3 durable weight bags that can be filled with up to 10 lbs. of sand Built with durable materials to withstand seasons of training SpeedSac, 3 Sandbags (Not filled), Belt, Leash Description Build explosive leg drive and speed right off the blocks with the SpeedSac. This variable weight sled allows you to strengthen your lower body muscles by resistance training similar to metal sleds. With three removable weight bags, the SpeedSac allows you to adjust the towing resistance up to 30lbs. 360 degree belt allows for multi-directional training built with durable materials to last over several seasons of training.