If you like stretching, walking, or running, do it in nature—for example, consider joining a group of people who congregate in a nearby park to practice tai chi, qigong, or yoga. Doctors say the best kind of exercise is the kind that you enjoy enough to keep doing consistently. If you like to socialize while working out, meet some friends at a high school football field, on a jogging trail, or at a local park. Breathe some fresh air, take in the lovely sights and sounds of nature, and work out while enjoying the camaraderie of others.