Figure 8 Abs Exercise:

Lay down on your back on a flat bench, or a mat. Keep your palms down on the ground, and your knees up in the top position of a lying leg raise. Inhale.
Slowly make a wide figure-8 movement with your knees. Do the same amount of repititions each way (clockwise and counter clockwise figure 8's). Exhale when your knees are far out to the sides, and inhale when your knees are directly above your body.