This study aims to compare core muscle stability, postural balance, and flexibility between healthy women who regularly practice Pilates and those with a sedentary lifestyle. The researcher will evaluate if long-term Pilates practice (5 months or more) leads to significant improvements in physical performance compared to a lack of regular exercise. Assessment tools include the Pressure Biofeedback Unit (PBU) for core activation, the McGill battery for endurance, the Y-Balance test for dynamic stability, and the Sit-and-Reach test for flexibility.