Olympian Michael Phelps on Retirement, the Butterfly and Athlete Activism

Now, when 28-time Olympic medalist Michael Phelps swims butterfly, it’s usually for an audience of one. When his 2-year old son Boomer waves his arms in imitation of the stroke, he knows what the toddler wants to see. “He knows the motion of the butterfly,” says Phelps. “So I do a couple of laps.