Kevin Plank is stepping down as CEO of Under Armour, the company he founded in 1996. Plank will become executive chairman and brand chief. Patrick Frisk, Under Armour's president and chief operating officer, has been named the replacement CEO effective January 1. In an interview with Business Insider last month, Plank and Frisk talk about how their leadership styles differ. Plank says he wants to run down the hill as fast as he can, while Frisk is there to make sure they have a plan and don't run straight into a tree. Sara Silverstein: And you're looking longterm now. What's the hardest thing about thinking longterm as a publicly traded company? Kevin Plank: This is where our partnership comes