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Abstract Objective: This study aims to determine the effect of the eccentric strengthening exercises on changes in foot alignment, height, and agility level malleolus of junior athletes. Method: This study used a pre-experimental time-series design. A total of 30 junior badminton athletes were recruited to participate. The age ranged from 11 to 15 years old. Data collection is done through the primary retrieval of data through the measurement instrument of foot alignment, malleolus height, and agility. Results: From the results of the SPSS Obtained a significant value of p = 0.0001 (P <0.05) after 18 times the exercise was given. Conclusion: There is an influence of eccentric strengthening exercise on changes in foot alignment, height, and agility malleolus in junior-level badminton players in Makassar. malleolus height and agility