Lie face up with your arms overhead and legs extended, resting on the floor.
Keep your abs engaged by pulling your belly button into your spin and pressing your lower back into the floor.
With control, lift your legs straight up. Be sure to keep your back flat on the mat. From here, lift your upper body off of the mat as you simultaneously reach your arms toward your feet.
Lower your arms and legs toward the floor to complete one rep. The more you bring your upper back off of the ground during the "V" part of the exercise and the lower you bring your arms and legs with each rep, the harder the move will be.