Are we born to run? - Christopher McDougall

Christopher McDougall explores the mysteries of the human desire to run. How did running help early humans survive -- and what urges from our ancient ancestors spur us on today? McDougall tells the story of the marathoner with a heart of gold, the unlikely ultra-runner, and the hidden tribe in Mexico that runs to live. (Filmed at TEDxPennQuarter.) Talk by Christopher McDougall.

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