Huh, now this is interesting. I've read up on the Tarahumara before. They're not really fast runners, but they can go for extraordinarily long distances without stopping, and often live on very little in regards to food. They literally will hunt deers by running them to death (i.e. the deer runs away from them and they pursue it for so long that it drops dead from exhaustion).
This is worth getting for the lore alone/to see where they go with the story aspects.