SKLZ SpeedSac Variable Weight Sprint Trainer Sled Trainer dart set including improved stability and protection

including improved stability and protection and a more comfortable fit

That’s why the Targeted Massage Ball features a unique texture

Protect your child’s hands while riding

DUAL-SIDED

Flexible nylon webbing and ergonomic rotating grips

SKLZ SpeedSac Variable Weight Sprint Trainer Sled Trainer dart set including improved stability and protectionBuild 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