Why Under Armour's Michael Phelps Ad Is One of the Most Shared Olympics Spots Ever

New data reveals the secrets behind its social success

This summer, Michael Phelps is swimming for his last time at the Olympics and collecting a few more gold medals along the way. Outside of his extensive hardware collection, Phelps has helped Under Armour and agency Droga5 hit some major milestones with his "Rule Yourself" ad, including a Film Craft Grand Prix at the Cannes Lions festival. Now it's become one of the most shared Olympics spots ever.