Muscle groups
Core, BackDescription
Begin by lying down on your back. Keep your arms at your sides sides and the palms of your hands facing down. Keeping your legs straight, lift your heels one inch off the ground.Drive your palms into the ground as you lift one leg toward the sky, keeping it as straight as possible. Keep your toes pointed toward your shins the whole time.
Lower the leg back to one inch off the ground, then switch legs.