I used to subscribe to Runners' World (before I got tired of how little actual content it usually has, then I moved on the Running TImes, which used to be great -- then I started getting frustrated with RT for the same reasons I'd dropped RW, and lo & behold, turns out it had recently been bought by Rodale, the company that publishes RW... anyway...) and remembered reading this article some time ago. Amazingly I was able to find it in about 5 seconds (what did we ever do before the internet?):
http://www.runnersworld.com/article/...8402-0,00.html
I think you will also see more muscle development with running, if that's important to you. But walking is still good exercise.
Also with regards to bone density -- I believe that walking is good, but running is better. Jumping rope is even better than running -- really!!! (It's actually great exercise too). From what I've read, the higher the impact of the activity, the better it is at building bone density.
Of course, you have to balance all of this with your personal propensity to get injured. Getting sidelined certainly won't help build your fitness (and it just sucks!).



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