From a questionnaire survey of baseball players, I found many self-reported cases of a damagedadductor. Not only the adductor but also the abductor takes on a considerable burden during pitching with reference to the leading muscles and antagonist, and augmentation of the abductor is required in addition to adductor augmentation. Therefore, I recommend three kinds of player training as follows: muscle force augmentation for the adductor and abductor using a physical therapist's manual as before, training with a machine like KIN-COM, and an exercise called "closed kinetic." One such exercise involves standing up with a single crus and pulling up the pelvis, and moving right and left like skating on the sliding board.