"I just wanted to point out how wrong this comment is. People have been barefoot running for thousands of years. You don't barefoot run heel first, but with the ball of the foot. Look up the Tarahumara tribe or Kalahari tribe who run for hours barefoot. There's also a lot of research done by academics: http://blogs.nature.com/news/2010/01/nature_video_the_barefoot_prof.html"