1. Start by lying on your back and a slight bend in your knees.
2. Raise your legs to a perpendicular position to the floor. This is your starting position.
3. Slowly lower your legs until you are no longer able to keep your abs tight and your low back on the floor.
4. Raise your legs back up to the starting position and repeat.
5. Only lower your legs as far as your abs have enough strength for.
