Cole Campell is a freshman at St. Albans School in Washington, D.C. He recently spent a day with us at Fool HQ learning more about the stock market. He chose to focus on Under Armour (NYSE:UA) for the day and discussed it with our analysts and editors. Here he shares his unique perspective as a young investor watching an upstart company challenge an older, dominant brand.

Sam Cicotello has no position in any stocks mentioned. The Motley Fool recommends Nike and Under Armour. The Motley Fool owns shares of Nike and Under Armour. Try any of our Foolish newsletter services free for 30 days. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.