The SKLZ Speed Sac is an Indoor/Outdoor Variable Weight Sprint Trainer. Build explosive leg drive out of 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 removable weights, the SpeedSac allows 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 3 durable weight bags that can be filled with up to 10 pounds of sand (30 pounds total)
- Won't harm grass or mar wood floor
- Adjustable leash length to accomodate athletes of any size
- Includes Instructional DVD and 6-week progressive training workout plan
- Improve your overall speed and explosiveness
- Great for baseball and softball training, as well as other sports