Basic Crunch
Lie face up on the floor with your legs hip-width apart and knees bent about 45 degrees. Place your hands behind your head, but do not lace your fingers. Lift up toward the ceiling until your shoulders leave the ground. Exhale on the way up and concentrate on pulling your belly button down toward your spine. Lower to starting position and repeat. Keep your chin lifted and make sure you're not pulling on your neck.
Number of Reps: 10-15