The New York Times recently published a short column asking the question: How does race walking stack up against running in terms pf positives (fitness and health) and negatives (injuries)? see article
NY Times Article: Is It Better to Walk or Run
http://well.blogs.nytimes.com/2013/05/29/is-it-better-to-walk-or-run/
Walking and the Brain
MEDICAL NEWS – Walking and the Brain See the article below which was supplied by Marv Larson, It appeared in a Vanguard newsletter and is reprinted from an August 2011 Mayo Clinic Health Letter. >>>> Walk_article001