An abdominal crunch is an exercise to strengthen the abdomen by contracting it to flex your spine and pull your torso off the floor. To perform an abdominal crunch lie flat on the floor with your knees bent so that the soles of your feet are flat on the floor. Lie flat on your back with your head flat on the floor arms on your side palms down. To initiate the crunch, use your stomach muscles to pull your upper torso off the floor, continue to look straight up at the ceiling and pull your torso up far enough that your hands move 2-3 inches, then return to your beginning position.
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