Cycling Crunches
Besides the regular crunches, doing a variations of crunches will help you strengthen your body coordination, balance and lower abdominal muscles. For these crunches, lie down on a gym mat. Raise both the legs off the floor and balance them. Place your hands below your head and lock them. Now, move your legs as though you are cycling in the air. As you gain momentum, twist your torso so that your right elbow touches the left knee and the left elbow touches the right knee.