DECEMBER 20---A three-time U.S. Olympian whose illustrious running career has included a Nike TV commercial, a swimsuit calendar, and ongoing promotional work for Disney has spent the last year doubling as a $600-an-hour call girl, an astounding secret life that she now regretfully calls a “huge mistake.” Beginning last December, Suzy Favor Hamilton, 44, has worked with one of Las Vegas’s premier escort services, booking scores of “dates” in Sin City and other U.S. cities, including Los Angeles, Chicago, and Houston.While Favor Hamilton (seen at right) has used an alias, “Kelly Lundy,” when working as an escort, she inexplicably shared...