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This research is a kind of quantitative research using correlational analysis techniques followed by the aim of calculating the contribution of leg muscle strength and arm muscle strength to breaststroke swimming abilities of 50 m FIK UNP students. This research involved 30 male students. Data collection was carried out by measuring: (1) Swimming Test of 50 Meter Chest Style, (2) Leg Muscle Strength Used Half Squad Jump Test, and (3) Strength of Arm Muscles Measured with Stopwatch Through Pull-Ups Test for 30 seconds. The results showed a determinant coefficient with a significance level of α = 0.05. Keywords— Leg Muscle strength, arm muscle strength, 50-meter

Contribution of The Muscle Strength and the Strength of the Arm Muscle on the Ability of the 50 Meter Chest Style