By Mariah Ricci Karlie Kloss, American supermodel, knows a thing or two about fitness. Kloss who is only 24 already has been the model for Nike and Adidas, two huge athletic powerhouses. What makes Karlie so unique is that she is a model who has always taken her health very seriously. In an article from Fashionista.com, Kloss was applauded for her ability to brand herself as a model-athlete. “The interesting thing about Karlie is that she is that athlete woman. Her fitness is