Double Hip Extension

Start: Lie on your back and bend your knees so that your feet are flat on the floor. Slide your arms out to your sides at 45-degree angles, palms facing up. Tighten your core, then squeeze your glutes to lift your hips an inch off the floor.

Movement: Raise your hips toward the ceiling until your body forms a straight line from shoulders to knees. Pause, then lower to the starting position. That's one rep.