Instructions
Lie face up on the floor, with your hips and knees bent and feet off the floor. Placing your hands by your ears and elbows out wide, raise your shoulders off the floor until you feel a contraction in your stomach muscles. Slowly straighten one leg down towards the floor, only going as low, as not to arch your lower back, from there return your leg, and then repeat on the other side. Repeat for desired number of reps.
Tips
To make this easier, keep your head on the floor and your hands under your lower back for support. Also, place your tongue at the roof of your mouth to avoid overusing the neck muscles.