30 Side Plank Hip Lifts (15 on each side). Get into side plank position with your elbow on the ground and your legs and hips resting on the ground. Engaging your abs and keeping your body in a straight line, raise the lower half of your body up off the ground into a straight plank position. Lower again and repeat. Do 15 on your right side, and then 15 on your left side.
30 Bicycle Crunches. Lie on your back with your knees bent and your hands behind your head. Do not clasp your hands together. Engage your abs, lifting your shoulders and upper back off of the ground. At the same time, move your right elbow toward your left knee so that they meet in the middle of your body. Next, switch your position by bringing your left elbow to your right knee. Continue as quickly as possible while still keeping your torso raised up off the ground.