When Michael Phelps won his record-breaking 19th career medal at the 2012 Olympics in London, he became the most decorated Olympian of all time. By the end of his time in the pool, he had earned 22 medals, 18 of them gold. To put those numbers into perspective, only four others have won at least nine gold medals — Larisa Latynina, Carl Lewis, Paavo Nurmi and Mark Spitz. Each finished his or her career with a total of nine gold medals, putting Phelps' accomplishment at double. Latynina earned 18 total medals during her career, but Phelps moved past that number this summer. The question now is: What's next up for Phelps in his post-swimming career?