The indigenous people who are born to run

GUACHOCHI, Mico - In old indigenous Latin American cultures, women toil at farming and tackle family duties. Atop this remote Mexican mountain, they also slap on sandals and crush pro athletes on long-distance runs.

Talk about extreme sports: the Raramuri people - part of the Aztec family - over five centuries ago fled up the mountains of Chihuahua state to stay safe from Spanish invaders. There they stayed.

Over the years they have become cliff-dwellers, often sleeping in caves.