SKLZ SpeedSac Variable Weight Sprint Trainer Sled Trainer sipper bottle with straw Warmth and support

Warmth and support

The football doesn’t slip easily

Made from a very durable

for a reliable

has a shatterproof backboard

SKLZ SpeedSac Variable Weight Sprint Trainer Sled Trainer sipper bottle with straw Warmth and supportBuild explosive leg drive and speed right 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. Note: Only use on grass, turf or wood surface. Use on