Michael Phelps isn't saying never to a return to the water. In a new interview on with co-anchors Savannah Guthrie and Hoda Kotb, Phelps said there's three things that would persuade him to come out of retirement and swim again: his kids, Boomer, 5, Beckett, 3, and Maverick, 1.«I get in the water from time to time for my own personal mental health,» Phelps clarified Monday.