Introduction: Pitchers perform multiple overhand throws that involve fine coordination of all body segments (MacWilliams, Choi, Perezous, Chao, & McFarland, 1996). “Pappas et al. described baseball throwing as a sequential activation of body parts through a connecting segment beginning with the contralateral foot and progressing through the trunk to the rapidly accelerating upper extremities” (MacWilliams et al., 1996). Sports medicine practitioners are increasingly concerned that the number of baseball pitchers suffering from elbow injuries appears to be increasing. Baseball pitchers use multi-joint movements, which are joints that rotate due to muscle torques, gravity, and interactions. Previous research suggests that the main risk factor may be due to overuse of the muscles, so the risk of elbow pain correlates with the number of pitches thrown in a game and over the course of a season (Fleisig, Weber, Hassel & Andrews, 2009). Therefore, in order to minimize future injury/risk, an appropriate experiment should be performed to determine what potential changes in muscle function would be most beneficial (i.e. muscle torques at different joints and forces underlying muscles) for learning a skillful throwing movement (Jindrich, 2014). .* FOCUS ON THE UPPER LIMB* Some studies suggest that practicing the muscular forces of key players (wrist, elbow and shoulder) in opposition and modulation with the interaction and torques of gravity in the upper limb should lead to an improvement in throwing skills. (Hirashima, Kudo, Watarai and Ohtsuki, 2006). Similar to Masaya Hirashima and colleagues' research, they found that participants used interacting torques to generate greater velocity during shoulder internal rotation, elbow extension... .. middle of paper ...... l players.J Neurophysiol, 680-691. doi:10.1152/jn.00348.2006Jindrich, D. (2014). Segmental dynamics in motion. Kine 301: Case Study 2, Kinesiology, Cal State San Marcos, San Marcos. MacWilliams, B., Choi, T., Perezous, M., Chao, E., & McFarland, E. (1996). Retrieved from http://ajs.sagepub.com/content/26/1/66.short Posner, M., Cameron, KL, Wolf, JM, Belmont, PJ, & Owens, BD (2011). Epidemiology of major league baseball injuries. The American Journal of Sports Medicine, doi:10.1177/0363546511411700 Yamada, Y., Yamashita, D., Yamamoto, S., Matsui, T., Seo, K., Azuma, Y., Kida, Y., Morihara, T. , Kimura, M. (2013). Whole-body and segmental muscle volume are associated with ball speed in high school baseball pitchers. The American Journal of Sports Medicine, doi:10.2147/QAJSM.S42352. Retrieved from http://www.ncbi.nlm.nih.gov/pubmed/24379713