Today is National Walking Day. Join the celebration by taking a walk. This particular health observance is sponsored by the American Heart Association (AHA). Although it applies to everyone, it’s really aimed at adults who spend most of the workday sitting. The heart association hopes to get workers out of the office, store, or factory for a 30-minute walk. And not just today, but every day. If you don’t exercise, or do it only now and then, walking is an excellent way to get more physical activity. Just 30 minutes a day of brisk walking (or other moderate exercise), helps your heart, blood vessels, muscles, brain, and the rest of your body. If you don’t usually exercise, use National Walking Day as an invitation to get started. If you do exercise, use the day to invite a friend to get on the path to better health with a walk.