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Dr. George Knox, Ultra Marathoner

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Dr. George Knox, Ultra Marathoner

Dr. George Knox, Ultra Marathoner

Dr. George Knox, Ultra Marathoner

  • Download
  • <iframe src="https://www.npr.org/player/embed/901862/901863" width="100%" height="290" frameborder="0" scrolling="no" title="NPR embedded audio player">

Dr. George Knox is a 91-year-old psychologist and hypnotherapist in Ohio who also is an ultra marathon runner, competing in races of more than 60 miles. He shares his secrets.

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