Seriously, we spend most of our formative years getting educated, not doing physically demanding work or hunting. With technology, the physically weaker can not only survive, but thrive. Those born sickly can grow and thrive. Given all that, I can imagine on average we are physically weaker as a species. But I'd be willing to bet the best athletes we have today would kick the crap outta the best of the times the article talks about.
Seriously, we spend most of our formative years getting educated, not doing physically demanding work or hunting. With technology, the physically weaker can not only survive, but thrive. Those born sickly can grow and thrive. Given all that, I can imagine on average we are physically weaker as a species. But I'd be willing to bet the best athletes we have today would kick the crap outta the best of the times the article talks about.