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Mark Dean recalls his Boston Marathon experience: A promise to a first responder

Mark Dean recalls his Boston Marathon experience: A promise to a first responder

For Mark Dean there were two Boston Marathons, the one that he trained for and the one he ran. Although he ran qualifying marathons in the flatlands, he trained in the mountains. The low atmospheric pressure and the highs he experienced running in the mountains sustained him well during the first 20 miles of the…