Tuck and Extend
The Tuck and Extend exercise works your abs, lower back, butt, and hamstrings.
-Total Body Recharge. Tuck and Extend: For this move, you'll alternate between a tuck position and extending out so that your body is parallel to the ground. To make it easier, put your right hand on your hip and reach for the ground with your left arm. Do 12 reps, switch sides and repeat.