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Summary: Oblique crunches using a stability ball will thin out the waistline and work the abdomen. Learn how to do oblique crunches with a stability ball with tips from a professional trainer in this free exercise video.
"This next functional core exercise is the oblique crunch. Now, when we're working the obliques -this is a really great muscle area to give that really thin waistline. So come on down to your back. Place your feet up on top of the stability ball. You're going to cross your left foot over your right knee. Extend your left arm. Wrap your right hand behind your head, and then you're going to cross over and then lower back. Now the idea here is to bring your shoulder towards the knee as opposed to your elbow. As you lift up exhale as you cross over, inhale as you lower down. Cross over and come back. Then, when you have done a few of these, then you can hold your shoulder blade up off the mat, and tiny little pulses. That really isolates your oblique area. Now make sure that you're not yanking on your neck and that your obliques are doing the work. Then you can go back to simple singles, up and back. Then when you're finished with that side go to the other side, perform this exercise until you really feel that burn. And then when you're through, just simply come out of the position. Those are your oblique crunches."
eHow Article: Stability Ball Oblique Crunch Exercise