Abdomen
1. Lie on your back with your legs straight and your hands by your sides or tucked under your glutes for support. 2. Keep your lower back pressed firmly against the floor and lift your legs together until they are perpendicular to the ceiling. 3. Slowly lower your legs back toward the floor, stopping just before they touch the ground. 4. Maintain constant tension in your abs throughout the movement to prevent your back from arching.
