Walk more. Any kind of walking is beneficial to your system and can help to keep your weight down, keep you limber, give you a more optimistic mood, and help your body to function more efficiently. Leave your cell phone at home and look around. If you do not own a pair of sneakers you must consider getting a pair. It will make walking easier and more impact free. The range of walking sneakers is extremely great and you have to do some research to find the best pair and brand for you, depending on your arch, your walking posture, pronation etc. Walk, swing your arms, breath, all in the now.