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I'll bet Libermann runs himself - there's a hint of personal obsession and wishful thinking in this. In Born to Run I began to get sceptical when it got to the point where Liebermann claimed that it would have been likely that whole tribes, men, women, and children would run after game. Well, we know of no anthropological example of that. And it's pointless making unsubstantiated (and intrinsically unlikely) claims about societies in the distant past that we can't observe. It's really just making it up. Maybe he's being politically correct - different people in all real societies, except to a certain extent our own, tend to carry out different tasks - so maybe he's saying that to pander to the prejudices of our own society. Or maybe he's just so carried away by running he can't resist claiming that all people of all sexes and ages did it all the time.
Yes, primitive people could run very long distances. We're physiologically capable of it, and there are enough reports of people in the record hunting in this way. Here's an old newspaper article on "How Apaches Hunt Deer":
Tribesmen also sometimes ran long distances to get away after raids on other tribes - at any rate if they didn't have horses with them. (You might undertake a raid to snatch captives, for example. After that, you'd run like hell and keep going - and the captive would know to keep up or get a hatchet in his brain.) Woodland Indians from the Northeast of the U.S. certainly did - Plains Indians, too, and the Zulus.
The Apaches would train boys to run up and down mountains carrying rocks. They'd also make them to run with a mouthful of water and spit it out at the end of a course: that trains you to breathe through your nose, since breathing through your mouth dries the throat in the desert air and makes you less efficient.
But I think the thing to remember is that this wasn't the only physical activity primitive people engaged in. People get bloody obsessed by running, and it's all they do in the way of exercise. People living in the "wild" state could run, could carry, could climb, could throw, could likely swim, and so on. Over-specialization results in individuals who can't do lots of things. And it is the high road to injury.
There are a couple of sites that are often linked from this site, Exuberant Animal and Movnat. Both those sites recommend people to develop all-round physical abilities and warn against over-specialization.