This is a great exercise I've used with runner's who have issues with keeping their hips steading during their runs.
It's an isometric exercise with a large core stabilization component built into it. You're rock solid if you can do this and make it look as if you still have two feet on the floor.
HOW TO:
- Lie supine with your feet hip width apart with your knees bent.
- Bridge up squeezing your glutes.
- Now without letting your hips drop, pick one foot up off the floor.
- Put it down and repeat in an alternating fashion for reps.
This is also a great exercise when lightly loaded for individuals seeking more glute hypertrophy.