 Exercises, as conservative management, were shown to be effective in increasing function and in decreasing pain related to RCT. However, the lack of studies comparing different types of exercises i.e. concentric, eccentric, scapular strengthening, proprioceptive, coactivation is reported by many systematic reviews. One type of exercise, coactivation strengthening, could be more efficient. Coactivation strengthening implies a recruitment of the pectoralis major and the latissimus dorsi while performing regular strengthening. When theses muscles are recruited, the medio-inferior orientation of their tendons creates a force vector that limits the superior translation of the humeral head, thus limits the subacromial narrowing. 