3. Donkey Kickbacks
This exercise creates alignment and balance between your abs and your back muscles. Start on your hands and knees in tabletop position, with your knees directly under the hips and your wrists beneath your shoulders. Keeping your hips square, kick your right leg back and straighten it behind you. Hold for 10 seconds and then lower and kick your left leg back in the same manner. Do 10 to 15 repetitions on each side.