How to do Clam Shells (Right)

Instructions

Lie on your left hand side. Rest your head on your left arm. Then bend your hips to approximately 45 degrees and bend your knees at 90 degrees. Keep your hips stacked one on top of the other and your feet should be in line with your back. Draw your belly button in towards your spine and contract your right glute muscles to lift your right knee up away from your left knee by 4 to 6 inches. Then lower it slowly to the start position. Keep your feet in contact with one another.

Your legs should resemble a clam shell opening, hence the name. If done correctly you should feel the muscles around the back of the hip (gluteus medius and minimus) working really hard.