Exercise is an essential part of getting healthy. Yet so many people spend more time thinking of ways to avoid it than they would if they  followed the simple and surprising advice in this article.  Just move for at least 20 minutes a day.  Evidently all the major benefits of exercise occur during that time.    Special equipment, even sneakers, is not necessary.  So no more excuses – just start moving.  Park the car at the edge of the parking lot, stand up from your desk every twenty minutes, get on your feet while you are on the phone and you will start to get real and documented health benefits.

http://well.blogs.nytimes.com/2012/05/04/the-surprising-shortcut-to-better-health/?src=me&ref=health