Single-Leg Hip Raise

Start: Lie faceup on the floor with your right knee bent and your left leg straight. Place your arms out at 45-degree angles to your torso. Raise your left leg until it's in line with your right thigh.

Movement: Now squeeze your glutes and push your hips up until your body forms a straight line from your knees to shoulders. Pause for 2 seconds, and return to the starting position. Do all your reps, and then switch legs and repeat.