Unconventi onal throwing mechanics are utilized by some baseball pitchers, which include three-quarter arm, sidearm, and submarine styles (Figure 1). To minimize injury risk, detailed examination of muscle activation throughout the kinetic chain for each throwing style is necessary. The kinetic chain consists of interdependent links between body segments that are sequentially mobilized or stabilized during the performance of multisegmental athletic movement patterns. 1-3 During throwing, motion of the legs and torso generates kinetic forces that are transmitted sequentially through the scapula, upper arm, and lower arm segments. If a segment is not positioned properly, the athlete c a n n o t a d e q u a t e l y transfer energy to an adjacent segment. 4 This will result in a loss of energy transfer to the ball and will impose abnormal stress on ligaments and tendons. A compensatory strategy may involve greater reliance on the smaller, more distal segments of the upper extremity to maintain ball velocity. 1,2,5-8 We acknowledge that the lower extremities and the