This exercise can be done on the ground or on an incline situp board. All you need is something behind your head to hold. If you use the incline board, use it with your feet lower than your head.
Lying on your back, hold a weight or a chair leg (if lying on the floor) or the foot bar (if using the situp board). Keep the knees slightly bent.
Pull your pelvis and legs up so that your knees are above your chest and then return to beginning position.
This exercise is very similar to a hanging knee raise, but a little less intense.