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You see humans back then were a lot stronger than they are now. Humans as we evolve into more intelligent beings,our bodies become weaker.
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A quick search could find surprisingly little information on historic trends in human strength or Physiology. Height reached a peak around the Middle ages and reached a minimimum in the 19th century before reversing according to one source! I have always assumed it to be constantly rising. I recall it being suggested that the strength of English Archers may have been greater than modern man based on the drawing load of longbows found on the Mary Rose (or the design of them).
Height which is often used as a proxy for strength depends on genetics, diet, fitness and general health. Diet should have improved strength but I suppose the move from agriculture to industry, especially modern power assisted industry may have reduced it.
Genetic trends have complex causes. Fashion is important, look at the peacock for example! In modern society, a fashion for females to favour larger, stronger males will have a tendency to produce more of them, irrespective of any physical advantage this gives them. In times of food shortage perhaps the opposite might occur.