SKLZ Baseball Training System - 5-in-1 Essentials Kit Power Handle: improve rotational strength through forearm, arm and core resistance movements. Increase the strength in your connection with the ball. Lateral Resistor: increase speed of lateral movements and first step quickness, especially off of the base. Reaction Ball: develop quick hands and reflexes, which aid in catching and fielding balls. Bullet Band: strengthen arm for pitching and fielding. Speed Chute: maximize your top running speed through overspeed training to get you to the ball and bases faster.