This is another great exercise to target your lower abdomen. The slow movement helps to engage the core without letting muscles take over.
How to do it: Lie faceup with knees and hips bent 90 degrees. Lightly place your hands behind your head and lift your shoulder blades off the mat. Extend your right leg straight, bringing your chest toward your bent left knee (imagine you are trying to bring the bottom of your right ribcage to meet your left hip). Come back to center and switch sides, extending your left leg straight, bringing your chest up to your bent right knee. Make sure to keep your elbows out wide. Inhale at the center and exhale as you twist your upper body toward your knee. Continue alternating legs for 30 seconds.