Lie on your back with a pillow or rolled towel under your knees so your hips and knees are slightly bent.
Place your hands on top of your head.
Start the curl by moving your chin toward your Adam's apple.
Do not pull on your head.
Continue to curl your trunk as far as possible, then sit up.
Maintain the trunk curl as you sit up.
Return to the starting position by slowly uncurling your trunk.
