Second, the cheetah example is a poor one. Natural selection has molded cheetahs to be excellent sprinters so that they can catch equally fast prey, and this is more or less what they still do in the present-day environment. If a cheetah were a poor sprinter (now or thousands of years ago), that individual would die and not pass on its genes. In other words, it would be an evolutionary dead end.Following on this, you cannot compare the human population of today with that of our distant ancestors. I suspect that variation within early human populations was far smaller than it is Nike Air Max 270 Womens today, and I personally find Lieberman’s distance running hypothesis to be entirely plausible. Early humans had to be able to find and catch prey, and if they couldn’t Nike Air Max Classic BW Damdo it well, they would have died out. In other words, if you buy Lieberman’s persistence hunting hypothesis, early humans had to be able to run well to track and kill prey. There could very well have been subdivision of labor among individuals as Fitzgerald suggests, but I’m not sure that we’ll ever know that for sure with any greater degree of certainty than we’ll know if Lieberman is correct.In contrast to the above, modern humans rarely if ever have to run for our survival. We don’t need to hunt and gather our Adidas Ultra Boost Dames food, and the nearest supermarket is typically only a short drive away. In fact, millions of largely sedentary individuals manage to reproduce every year, so Nike Air Vapormax Femme there is no longer any selective pressure for a human to be well adapted to distance running. This doesn’t mean that our species didn’t evolve to be excellent at distance running, it just means that we no longer need this skill and deleterious traits that impede our distance running ability have managed to filter through the human population. So it’s quite possible that the human species evolved to run, but that many modern humans are not born to run in any way, shape, or form (barefoot or in shoes!).Perhaps the better analogy here would be to look at dogs. Modern dog breeds are descended from the wolf, which by all accounts is a fantastic distance/endurance running animal.www.jamlikhalsavast.se However, most dogs nowadays are domesticated and don’t need to chase down and kill other animals in order to eat. Nobody would think to take a chihuauhua for a 2Nike Air VaporMax Donne 0 mile run, or a bulldog for a speedy interval session. Just as some human individuals nowadays are built to run well and others are not, some dogs are better than others at distance running, and some possess traits that make them poorly suited to running at all. So with dogs we have an example of a species that evolved to run very well, but nowadays consists of highly variable individuals, some of whom are better suited to running than others. Is it not possible that the same type of situation could apply to humans? What if, like dogs, we descended from a much less variable population of excellent distance runners, only to have inactivity, medical advance, and modern Nike Air Max 90 Mujer Rosaconvenience lead to a loss of this ability in at least a portion of our population? If this is the case, then maybe some people can run barefoot just fine like our Nike Air Max 90 Dam ancestors did, but maybe others need a bit of corrective help along the way.I’ll finish with this – it is for the above reasons that I find the following statement made by Fitzgerald to be frustrating: “The romantic vision of an Edenic primitive humanity in which everyone ran like Kenenisa Bekele is complete hokum. Endurance running was very likely only ever a specialization of the few, exactly as it is today.” How does he know this? Maybe there are data out there supporting this contention (I’m not an anthropologist, so I don’t know the relevant literature), but a statement like this really needs to be backed up beyond simply referring to “evolutionary biologists other Nike Air Max 90 Femme than Daniel Lieberman”. Lieberman has provided a bunch of evidence to support his distance running hypothesis (both anatomical and physiological), and it takes more than Nike Air Max 90 Mens an unsubstantiated throwaway statement like this to shoot that down and call it hokum.