Thank you for viewing. Please be aware that this item shows signs of use. I hope it can be used by someone who understands this. The origin of the UCHIDA training bat. Training by swinging while experiencing the impact of the ball. The weight moves every time you swing, allowing you to train while simulating an actual batting stance. While strengthening the muscles necessary for hitting, it also has the effect of increasing the follow-through due to centrifugal force.