He shakes it up good and suggests that we gradually move toward running barefoot or almost barefoot in the Vibram FiveFingers, a glove-like shoe with just a thin layer of Vibram between the runner and the ground. He asserts that if we slowly shift over to less shoe, we'll see a reduction in the running-related injuries he claims 8 of 10 runners face each year.
I bought the FiveFingers. I wore them to garden. I wore them around the house. I wore them on a power walk. And then, I ran 5 miles on the trail in them. No pain. No pain anywhere. I hadn't had such a pain-free run in years.