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Clam shell exercise progression for strengthening the gluteus medius. From the side-lying position, flex both knees and support head with the down hand. Start by keeping feet together and separating the knees with rotating the pelvis. Next, separate the feet while keeping the knees together. Then elevate the top leg and repeat the last move (bring the foot to the ceiling). Finally, elevate and extend the top hip and repeat the same move—foot to ceiling.
