Long bamboo bat for training
"Long bamboo bat" is said to help you acquire the ideal form. Ball Park.com sells two kinds of long bamboo bats.
The trick for a long bat is to swing slowly and slowly while drawing a large trajectory so that the axis of the body doesn't get bumped. It is possible to hit the ball, but it is recommended to use it in the swing and the tee batting for the purpose of acquiring an ideal form to the last.