<![CDATA[This study aims to determine the relationship between arm muscle strength and arm muscle endurance with the 50-meter backstroke swimming speed of athletes from the Tirta Sriwijaya Aquatic Club. Employing a quantitative research approach, data were collected through observation as well as standardized tests and measurements. The total population consisted of 20 male athletes from the club, all of whom were included in the study using a total sampling technique. Data analysis was conducted using SPSS version 27, applying Pearson product-moment correlation, regression analysis, and multiple correlation tests. The results revealed a significant relationship between arm muscle strength and endurance with backstroke swimming speed, as indicated by a significance value of 0.00 (p 0.05). The correlation coefficient value of R = 0.876 suggests a very strong relationship between the independent variables (arm muscle strength and endurance) and the dependent variable (50-meter backstroke speed). These findings suggest that improvements in both arm muscle strength and endurance can substantially enhance swimming performance, particularly in backstroke events. Based on the results, it can be concluded that there is a statistically significant and strong relationship between arm muscle strength and endurance and 50-meter backstroke speed among Tirta Sriwijaya Aquatic Club athletes. This study highlights the importance of targeted strength and endurance training in optimizing swimming performance at competitive levels.]]>
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