Recent studies say that today's teens are less fit than ever before. Exercise is important for everyone. It aids digestion and helps give you more energy and endurance.
Exercise can help alleviate depression .
Regular exercisers produce greater than normal amounts of beta-endorphin , a hormone that increased pain tolerance, reduces the appetite, controls stress and, in general, improves one's moods. Ones that you enjoy that you are likely to do 3-4 times a week. Try exercising in a group. Or with a couple of friends. Join a club or class at the local Y. Take up a sport at school.