Work your abs and tighten your obliques with this reaching move.

-Reach Up: Lie on your back with your legs straight and cross your left ankle over your right. Keep your shoulders down and your whole lower body still. Tighten your abs. Reach your right hand up and across the center of your body. Hold for a few seconds then lower down. Repeat for 12 reps. Now switch sides, reversing your ankle cross and reaching up with your left hand. Repeat for 12 more reps. This move works your abs and tightens your obliques.