On the contrary: that Brian Jones (along with many other men) possesses a body which is capable of getting strong enough to lift 600+ lbs off the floor is pretty strong evidence that our evolutionary past often required humans to get pretty damned strong.

I imagine that hunters that could carry large heavy loads of meat that they killed back to the cave/tribe would have been positively selected for since a least the invention of the spear. Spears are older than the human species at around a million years ago. Plenty of time to evolve very strong hominids.