After retiring from professional swimming, Phelps is concentrating on more pressing matters: raising his son, Boomer, who was born last May.
"You know, it's still crazy," Phelps said at a press conference before the Rio Olympics. "When I'm holding him or laying on the couch with him, it's just awesome. … I've learned which cry means what. If he needs a diaper change, if he needs mom, all of these different cries. It's been a really fun journey over the last couple of years, and a journey that I think has made me the person who I am and helped me transform to me just being me."
(Photo: m_phelps00 on Instagram)