As the kids head back to school, many will begin their fall season of sports as well. But sports aren't just for kids. There are many reasons for adults to stay active in sports for as long as they are able. Approximately 45 percent of Americans exercise to help manage the effects of stress. Whether you like the single-minded focus of running or walking, or prefer the camaraderie of a baseball or basketball team, you'll feel better if you play sports.