Iten vs. The World: Mary Keitany and Emmanuel Mutai

The small town of Iten, Kenya has turned into a running factory, its high-altitude training center producing some of the best distance runners in the world.

Runners from around the globe come to Iten to hone their craft and train with top athletes, a group that this year included four Kenyans who are part of this year's London Marathon field.

In the clips below, 2014 New York Marathon champion Mary Keitany and 2014 Berlin Marathon runner-up (in the second-fastest marathon time ever) Emmanuel Mutai talk about life in Iten and their preparation for London, which features one of the fastest collections of elite marathoners ever assembled.