The claim that we were shaped for distance is a real scientific hypothesis with real critics, and the version in running books is not quite either.
Humans are poor sprinters and unusual distance movers. We have a long Achilles tendon, a nuchal ligament that stabilizes the head while running, large gluteal muscles that fire during running and not walking, and a sweat-based cooling system that lets us shed heat while moving in a way most quadrupeds cannot.
Bramble and Lieberman’s 2004 paper gathered those features and argued that endurance running was a selective pressure in human evolution rather than an incidental byproduct of walking upright.2
That is a serious hypothesis and it is not settled. It has critics on several fronts: the energetics have been questioned, the anatomical features admit of other explanations, and the behavioural evidence is thinner than the anatomy.
The behavioural piece usually offered is persistence hunting — running an animal to heat exhaustion over hours. It is the most vivid part of the story and the weakest link in it.
Documented cases exist, most influentially Louis Liebenberg’s accounts from the central Kalahari.3 But directly observed instances are few, and the inference from a small number of modern observations to a widespread ancestral practice is a long one. Some anthropologists reading the ethnographic and archaeological record find the evidence for persistence hunting as a major subsistence strategy considerably thinner than the popular retelling suggests.
So I would state it this way. The anatomical case that humans are built for sustained movement is strong. The story about how that capacity was used is much less certain, and it has become the part everyone repeats because it makes a better paragraph.
What survives the caution is worth having.
Whatever the evolutionary story, the body you have is unusually well suited to moving at a moderate pace for a long time, and unusually badly suited to sitting still. That is not a hypothesis; it is a description of the equipment.
Which reframes slow running. A great many beginners experience easy-paced distance as the boring preliminary to real training. On the anatomical picture it is closer to the thing the machinery is for, and the fast stuff is the specialization.
It also reframes being slow. The animal in question was never fast. It was patient and it did not stop, and those are the traits the equipment supports.
The first is the naturalistic argument: we evolved for X, therefore X is good for you. That inference does not hold in general — we evolved under conditions of scarcity, high infant mortality and endemic violence — and it should not be trusted here just because the conclusion happens to be one I like.
The second is the shoe argument. “We evolved to run barefoot” was the reasoning behind the minimalist boom, and the injury-prevention claims did not survive contact with the evidence. Feet that have spent forty years in shoes are not ancestral feet, and the transition is where people get hurt.
And the thing worth remembering underneath both: this is an argument about a species, not about you. Bodies vary, some people are not built for distance at all, and “humans are endurance animals” is cold comfort on the specific morning your specific knee disagrees.
Note — the naturalistic leap
We also evolved under scarcity, high infant mortality and endemic violence. The inference should not get a pass here just because its conclusion is congenial — and it is a claim about a species rather than about your knee.
What the anatomy supports, in practice.
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.
The anatomical case that humans are built for sustained moderate movement is strong. The endurance running hypothesis is serious and contested, and persistence hunting — the vivid part everyone repeats — rests on few observed cases.
What survives: do most of it slowly, be patient rather than fast, and treat “we evolved for this” as an interesting fact rather than an argument.