Super Athletes of the Sierra Madre Living in Mexico's Sierra Madre mountain range, the Raramuri Indians are some of the best long distance runners in the world, but how far can they run in the face of problems like environmental damage, loss of native lands, and the drug war? An American ultra marathon runner known as Caballo Blanco is fighting to help the Raramuri preserve their culture and tradition of long distance running. The Copper Canyon Ultra Marathon is the result. Check out Sterling Noren's short film here.