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I'm not really sure I believe that. There are plenty of modern humans who still live essentially the same existence as what we consider 'prehistory' in Europe, in many parts of the world. Even in the 'first world' most people lived like that through the medieval time.
Anyone who does physical work, whether it's a builder now or a Stonehenge-era farmer, would kick my arse, because I haven't physically trained and I don't use my strength on a daily basis. There's a lot of us in that position, so if you take some kind of average across the population then it will look like we have got weaker on a species level.
I'm afraid these people simply exaggerate - an they are not scientists either. When you look at the evidence it is clear they exaggerate a lot. It depends also what you mean by 'athlete'. Amateur powerlifters frequently have three to four times the strength of an average man and double to triple the muscle mass, pros may have five time sthe normal strength and can deadlift as much as they reckon a gorilla can. They also develop enormous bony attachments to support their large muscles. Even the Neanderthal was only reckoned to have about twice the average strength of today, for someone of the same height (they were quite short). Is he claiming that these farmers weighed 300 pounds or something? they would have to to exceed the best powerlifting athletes in musculoskeletal ability. Also muscle development does not correlate with jogging. This idea that muscle bound people can gallop at high-speed for miles is pure fantasy - distance running requires an endurance physique not large muscles. Bone density can also near or reach its maximum value of 2 in strength athletes, so these farmers could not have exceeded that either. These 'anthropologists' should study more basic physiology and try to be more critical and scientific.
Another interesting one for you - the left arm bones of medieval archers were about 50% heavier than those in the right arm, which is itself quite well developed. I think maybe these people look at the wrong type of athlete.
I would like to see a bit more science on that versus what was cited.
Although hunter-gathering is, of course, more intensely physical the depravations are also much more severe. Just the impact of ongoing adequate nutrition in childhood is a significant factor. One need do nothing more than look at parts of the world with inadequate nutrition to wonder about the validity of such sweeping statements.