Lie on your back with knees bent and feet on the ground and hands behind your head. Engage your abdominal muscles and slowly lift your feet off the ground until your knees are bent at 90 degrees. Contract your abs as you raise your head and shoulders off the ground. Bring your left elbow toward your right knee while at the same time extending your left leg. Squeeze. Slowly bring your left leg back in, and bring your right elbow toward your left knee while extending your right leg out. Squeeze. Repeat for a total of 30 repetitions (15 each side).
Before performing any abdominal exercises, make sure to check your abdominal muscles for separation – How to check for Diastasis