Did you know that 40% of all urban travel in the US happens within 2 miles of where people live? 90% of that travel is by car!
I love health promoting online campaigns with social tools and motivating challenges. I think it's an interesting approach to fitness and general practitioners in particular could consider suggesting adhesion to their patients.
http://2milechallenge.com is a great example.
I chose to be on the red team!
Their facebook page has many goodies. My favorite: