Fitness.com
Description:
Simple crunch that can be done anywhere.

Start: Lying with your back on the floor or a mat, place your hands behind your head or folded across your chest Bring your knees up to 90 degree.
Motion: Lift your shoulder blades off the floor towards your knees, focusing on pulling up with your abs, not your hands.
Like all ab exercises, exhale while doing the work (in this case, pulling your body up to your knees)
Finish: Inhale, and slowly lower yourself back to the floor.
*optional: as a personal preference, you can cross your feet.
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