Mary Wittenberg, the chief executive of New York Road Runners, figured it might be a rough day when she headed to Harlem in late August for the Percy Sutton 5K, a race held on a hazy, humid morning on the cusp of the fall marathon season.

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http://www.nytimes.com/2012/10/14/sports/under-mary-wittenberg-the-new-york-city-marathon-is-thriving-so-whats-the-problem.html?ref=newyorkcitymarathon