The physiology here is solid. The story usually told alongside it is not, and the people in that story have had to live with it.
Any English-language discussion of the Ráramuri now runs through one book: Christopher McDougall’s Born to Run, published in 2009, which sold enormously and shaped what most readers think they know.
It is journalism rather than ethnography, and its effects were not confined to the page. It set off a barefoot and minimalist-shoe boom, whose central claim — that minimal footwear prevents injury — has not been borne out; transition injuries, particularly bone stress injuries in the foot, are well documented. It also sent a wave of outsiders into the Sierra Tarahumara looking for an experience, with the results that usually follow.
And it fixed an image: the Ráramuri as effortless natural runners, living outside modernity. The people it describes are dealing with drought, displacement, and the presence of organized crime in the Sierra. Runners from those communities have competed and won internationally and have spoken for themselves about all of it. A romantic picture of a people is not a compliment to them, particularly when it obscures what they are actually contending with.
So I am going to take the physiological observation, which is genuinely useful, and leave the mythology where it is.
Running economy — how much oxygen it costs you to run at a given speed — varies substantially between people and predicts endurance performance among runners of similar aerobic capacity. That is one of the more solid findings in exercise physiology.3
A number of things affect it, and one of them is wasted effort: unnecessary muscular tension, poor elastic energy return, movement that does work without producing forward motion.4 The economy literature is clear that more force is not the same as more speed, and that a good deal of what feels like trying harder is energy going sideways.
The broader principle has a name in the movement literature — the tendency of practised movement to settle toward lower metabolic cost, sometimes called an economy of effort.7
What none of this says is that relaxing makes you fast. Economy is one factor among several, it is only weakly modifiable by conscious effort in the short term, and the interventions that reliably improve it are training interventions rather than acts of will.
When something gets hard, the reflex is to apply more force. Grip, clench, push. The face goes tight, the shoulders rise, the hands make fists.
None of that produces forward motion. It is a display of effort, produced by a nervous system that has confused straining with working, and it costs oxygen that the parts of you doing the actual job could use.
The correction is unglamorous: at the moment it gets hard, check the hands, the jaw and the shoulders, and let them go. It does not make the hill shorter and it makes a small measurable difference to what the hill costs.
Hard efforts are hard, and a philosophy of lightness can become a way of never going there.
Some of endurance is straightforwardly unpleasant and no amount of relaxation changes that. “Run light” applied to an interval session is a misapplication; the point of that session is to be uncomfortable, and the discomfort is the stimulus rather than a technical fault.
The distinction: release the tension that is not doing work, and accept the effort that is. They feel similar from inside and they are not the same, and telling them apart is most of the skill this essay is describing.
Note — not every discomfort is waste
Hard sessions are meant to be hard, and the discomfort is the stimulus rather than a technical fault. “Run light” used to avoid ever going there is the failure mode of this idea.
Three places, checked when it gets difficult.
This series discusses running practices belonging to specific Indigenous nations of the Americas. Where a practice belongs to a named people, it is named; where a source is an Indigenous author, runner or organization speaking publicly about their own tradition, that is said. Ceremonial and religious specifics that those nations have not made public are not discussed here and are not the author’s to convert into technique. General claims about running physiology and psychology are cited by author and publication, with links where a stable public page exists.
Running economy is real, wasted tension is a genuine cost, and more force past a point is energy going sideways. Training improves it; noticing improves it slightly.
And the book that made these runners famous set off a footwear boom whose central claim did not hold, sent outsiders into their territory, and fixed an image that obscures what they are actually dealing with.