Recommended by Lisa Yirce PT, DPT to strengthen glutes:

“We use clam shells to increase glute strength for anyone with low back pain, hip pain, and knee pain. It is a great exercise for runners, and any sport really, because your glutes stabilize the pelvis when on one leg, which people do all the time during athletic activities.”

Instructions: While lying on your side with your knees bent and an elastic band wrapped around your knees, draw up the top knee while keeping contact of your feet together as shown.

Do not let your pelvis roll back during the lifting movement.