For Michael Phelps, 22 Olympic medals, 18 of them gold, really is enough, as he confirmed that his swimming career is over.
In an interview with Bob Costas on NBC, Phelps said he has no regrets about his career. "I can look back at my career and hang my suit up and say I've done everything I wanted to do," Phelps said.
Source: Business Insider. Read full article. (link)