The Barkley Marathons consists of five loops, 20 miles each, along unmarked trails in rural Tennessee, with about 67,000 feet of elevation. David Allan/CNN If accepted into the race, runners get a "letter of condolence." David Allan/CNN Barkley runners jump into a creek and wade through a tunnel that goes under Brushy Mountain State Penitentiary. Instead, it was weeks of training that laid the foundation for Paris’ Barkley success. We know that travel is a huge component of the carbon footprint of running and racing.”Regardless of whether she returns, the Barkley Marathons is an event that Paris will always hold dear.

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