50 Days – of running with Mark Duncan. 
Mark is a comedian disguised as a runner. He has a fund of stories, impersonations, and jokes; he manages to turn a minor incident into a major news  event; and he is always unfailingly positive. This makes him the perfect running  companion –because running with Mark will turn any distance into a happy  adventure.  And I have had the  privilege of his company for 50 days.

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