You need aerobic exercise to keep your heart and lungs working their best. But what happens when you ignore aerobic exercise and spend most of the summer playing computer games with your friends? Chances are, you gain weight. When you try on your jeans for school, you can barely pull up the zipper.

Aerobic exercise keeps you super-fit — and healthy. It helps you maintain a normal weight, reduces your “love handles,” and even eases stress, so you smile more and complain less. Studies show that increased stress hormones may be the cause of belly fat. And what’s the best stress reliever? Exercise!