
The clamshell works the gluteus medius while lying on your side.
Lie on your side with your hips and knees bent, your feet stacked on top of each other, and your head resting on your arm.
Keeping your feet together, open your top knee as high as possible, then close it slowly.
Your pelvis must not roll backward: only your thigh moves.
Image and text: Bryl Lim / Everkinetic — recoloré et rastérisé — CC BY-SA 4.0, via Workout Guide. Original entry