The countdown to Rio is on! Before you tune in to the 2016 Summer Olympic Games in Rio de Janeiro, however, look back on past Olympic greats in an Oprah: Where Are They Now? special. Celebrate the world-class athletes whose strength, determination and fortitude won the hearts of a nation. Follow up with legendary Olympians Carl Lewis, Gabrielle Douglas, Mark Spitz, Dara Torres, Michael Phelps, Nadia Comaneci, Bart Conner, Misty May-Treanor, Brandi Chastain, Kerri Walsh Jennings and Greg Louganis.