Sklz SpeedSac Fitness Its use of variable weight

Its use of variable weight strengthens your lower half

combining balance

Comfortable anatomical fit

Velcro closure

Center Ring for Ring of Fire training

Sklz SpeedSac Fitness Its use of variable weightOutrun The Competition! Is your lack of speed preventing you from becoming a gamebreaker If so, this training aid can help. Its use of variable weight strengthens your lower half, which enables you to explode from a set position. On the court, on the field. It doesn't matter. For once, you'll be ahead of the pack! SKLZ Speed Sac Sprint Trainer features: * Quickly improve your overall speed and explosiveness * Safely strengthen lower body muscle groups