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Purpose: This study aimed to identify the exercise posture that most efficiently activates the scapular upward rotators among three positions. Methods: Participants were divided into three groups based on foot placement: the 100%, 150%, and 200% groups, with each group randomly assigned 30 participants. The 100% position involved placing the feet to support the wall with the forearm in the wall slide position, transitioning from a standing position. As for the exercise method, a wall slide exercise was performed up to 150˚ shoulder joint flexion, and scapular upward rotator muscle activity was measured during the 5 seconds of concentric contraction. Results: Serratus anterior muscle activity was measured at 46.91±5.96 in the 100% group, 66.97±6.40 in the 150% group, and 45.92±6.77 in the 200% group. A statistically significant difference was found between the 150% and 100% groups, as well as between the 150% and 200% groups (p<.05). No significant difference was observed between the 100% and 200% groups (p>.05). Additionally, no significant differences were found in upper or lower trapezius muscle activity across the three positions (p>.05). Conclusion: The highest serratus anterior muscle activity was observed in the 150% group, where the feet were positioned at the middle distance. Thus, performing the wall slide exercise at the 150% position is considered optimal for activating the serratus anterior muscle.