Encore: A study of this champion's heart helped prove the benefits of exercise wrkf.org - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from wrkf.org Daily Mail and Mail on Sunday newspapers.
More than a 100 years ago, doctors thought that too much running or other vigorous activity could harm us. Marathoner Clarence DeMar proved them wrong.
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