Michael Phelps Goes Rugged in New Under Armour Ad

What has Michael Phelps been up to since winning six medals, four of them gold, at the London Olympic Games in 2012? Training of course. And growing one hell of a beard.

In a recent ad for Under Armour, the most-decorated Olympian in history shows off what hard work and unwavering dedication can do. Phelps originally announced that the 2012 games would be his last but left retirement in 2014 and is ready to make this year's games in Rio de Janeiro his last hurrah.

As amazing as it is, don't get used to the beard. Phelps will likely be back to his hairless, least-amount-of-drag self this summer when he competes.