Michael Phelps at 2016 Olympics?
He retired after his four-gold, six medal showing at the 2012 Olympics. Now it appears Michael Phelps might be aiming for a comeback in 2016. The legendary swimmer has rejoined the U.S. drug-testing program, which would make him eligible for the 2015 world championships -- a natural preparation point for the Olympics. Longtime coach Bob Bowman said Phelps' return to training is just to get in shape. But Phelps said this summer that "I don't know what's going to happen in the future" -- meaning a return might be coming.