Crunch

Setup
Lie on your back with knees bent and feet shoulder width apart, with hands behind your head.
Movement Instructions
Flex waist (contract abs) to raise upper torso and roll shoulders up off the ground, pointing chin to the ceiling through movement. Return to original position. Repeat.
Comments
Use your core by squeezing the abs to roll the shoulders up, hips should not move (do notuse momentum). Hands can be at either side of the head to support, but do not pull your head with your arms to help.