Crush It™ Spike Trainer was designed to allow players to perform many repetitions without having to stop and shag balls. Players can improve spiking technique, approach, arm swing, vertical jump and endurance. Crush-It™ is an effective aid for teaching full arm extension and correct body position in relation to ball at contact. This is an excellent motivator for conditioning for contiguous hitting approaches or block jumps. The ball attaches on side to allow player to hit on top of the ball. Easily adjustable to different heights of players or easy set up in the corner in a gym.