This weekend marked the start of fall marathon season, with more than 20 races taking place from Allentown, Pennsylvania to Ventura, California. Some of the biggest and most competitive races are just months away, meaning runners across the globe are kicking their training into high gear. Among them is supermodel Christy Turlington Burns, a veteran New York Marathon runner who is in the midst of prepping to become a first-time Chicago Marathon competitor this October.
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