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Background: The purpose of this study aimed to examine the effects of adding a gluteus-medius exercise to an ankle stability exercise on ankle function and balance in adults with chronic ankle instability. Methods: The study included 30 adults with chronic ankle instability living in Daegu province who were randomly divided into an experimental group performing the gluteus-medius exercise during ankle stability exercise and a control group performing the ankle stability exercise only (n=15 each). Before the test, the Cumberland ankle instability tool (CAIT) was used to identify chronic ankle instability, the Y-balance and hop (square, figure of eight, and side) tests were used to assess dynamic stability, and the balance error scoring system (BESS) was used to examine static stability. SPSS statistics version 27 (IBM) was used to analyze the data. Results: Both groups showed statistically significant differences in the CAIT, Y-Balance test, hop test. There was a meaningful difference between the groups. Conclusion: According to the results, it is considered an effective intervention to incorporate gluteus-medius strengthening exercises along with ankle stabilization exercises in the rehabilitation program for improving balance and ankle function in adults with chronic instability.