Michael Phelps Returns for One Last Swim in Under Armour's Haunting New Ad

Bearded champion preps for Rio

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Michael Phelps has been an Under Armour endorser since 2010, but of course, he's only truly in the spotlight quadrennially, during the Olympics. Now 30 years old, the world's greatest-ever swimmer is making one final Olympic push—for the Rio Games this August. 

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