Why the human foot was made for running long distances -- even without shoes - ESPN
Running barefoot or with little protection over long distances, like Mexico
Running barefoot or with little protection over long distances, like Mexico's Raramuri people are famous for doing, may seem extreme, but science suggests otherwise.
Study: Humans Were Born To Run Barefoot : NPR
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The science behind barefoot running
Why the human foot was made for running long distances -- even