Twenty-three million adults (10.7 percent) and 9 million childeren (12.7 percent) in the U.S. have been diagnosed with asthma at some point in their life. The Good News: Gone are the days when people with asthma are forced to sit on the sidelines. More than ever they are discovering ways to control symptoms, be fit and active. Tina Vindum visits with Dr. William Silvers on how to stay active--even with asthma.