The adductor showed over 80% MMT in both phases for the bilateral lower extremities of theplayer group. This indicated that the adductor was the main source of pitching energy to the upperextremities, and the adductor contributed to the stability of the body trunk and to the deceleration of the upper part of the body in the latter phase of pitching. The adductor and quadriceps in phase 1 of the non-pivot leg were strongly active to preserve energy for pitching. In phase 2, the adductor, biceps and tibialis anterior of the pivot leg and the adductorof the non-pivot leg may contribute to prevent burden to the upper extremities.