I recently saw this author on TV talking about 100 year old men running long distances barefoot. Here's an article about the theory behind it. It sounds like a "what works for you" idea. I might be interested in trying it; I get some pain in my heels when I run so I know I don't have proper form. There are minimalist shoes that can be worn to protect the feet, but they were made for water wear, so maybe I'll wait till the next line for runners is available.