Scissors

Lay flat on your back. Place your hands underneath your hips. Lift your head and shoulders off the ground. Lift your feet about 6 inches off the ground and open and close your legs in a scissors motion, crossing one leg on top of the other each time you close them. If your neck gets tired, rest your head on the floor for a second or two and then lift it up again. You neck has muscles that need strengthening too!