John Brewer is a runner who works in science, and a scientist who studies running. We hear stories about the right kind of shoes, diet, hydration and technology but what's the evidence underlying the hype? John talks about how our bodies respond to heat, food and running barefoot, and how runners probably deserve that extra piece of pie during the holidays.

We were like kids in a candy store (or rather runners in a shoe store) for this one, so forgive us the indulgence!

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