Another bit of evidence that modern running shoes are worse for us than no shoes.
“Runners who wore sneakers ended up landing heel-first 75 to 80 percent of the time. By contrast, barefoot runners usually land toward the middle or front of the foot -- a dramatic difference that recalls the more natural foot strike of early Homo sapiens. Needless to say, early humans certainly were not born to run wearing Nike or Reebok.
The heel-landing without shoes means a painful collision force of 1.5 to 3 times human body weight. But cushioned sneaker heels have allowed runners to change their stride to high-impact running, and likely open up a whole world of pain involving foot and leg injuries.”