I've met / seen some of the women, and they're tiny, small in stature and build. I'm 5ft 3 inches, and am "tall" next to some of them. Plus you have to remember that their community doesn't drive to FastFoodChain for a burger and fries for a quick lunch - someone actually fixes real meals - which would probably be considered meager by some standards.

And if I recall correctly, it's the men that do most of the running.

I think overall some of our injury problems are from the desk job / occasional athlete issues. Anthropologists have looked at bones of indigenous peoples and found that they do have injuries, they just continue to move. What is the life span of the Tarahumara Peoples? That would give an indication on their injury recovery rate. For us, a broken leg is something that can be fixed and recovered fully from; for them, it might just kill them. I've been in the heart of the Sierra Madres of northern Mexico and time could have stood still 100 years ago. It is truly a 3rd world country. Food was being packed in to a ranch by mule train, the children didn't go to school, and the only medical help was the knowledge they had themselves.