If you want to slim down and lose weight, it is unlikely that just exercising or just dieting will do the trick. For quicker, longer lasting results, you need to both get moving and to limit your food intake. And, if you truly want to look fabulous, you also need to develop lean muscles mass, which I recommend that you do with yoga or weightlifting, depending on your body type. Read The New York Times “Dieting vs. Exercise For Weight Loss,” to learn more about why burning calories by exercising only is not entirely effective.