Vertical-leg-crunch-for strong abs - extreme ab workouts - image - Women's Health & Fitness

 

Vertical leg crunch

Start with your lower back pressed to the ground. Put your hands behind your head for support.

Extend your legs straight up in the air, crossed at the ankles with a slight bend in the knee. Contract your abdominal muscles by lifting your torso toward your knees.

Make sure to keep your chin off your chest with each contraction. Exhale as you contract upward; inhale as you return to the starting position.

Repeat.