Did you not make the thread about fitter and stronger people being more useful?
You've essentially answered your own question. A woman is attracted to a 'ripped' man perhaps because at a base level instinct tells her a strong man can defend her and her children, and will produce strong, heathy children. Of course this is not necessarily the case in society now, many other factors play a part.
Humans are not lions. Traditionally who was always best equipped for hunting? The kings and nobles would have the finest horses, dogs, hawks and rifles for hunting. Humans have always enjoyed hunting in the past, it is part of our ancestry.
So it's likely that in the distant past, when we were less civilised, the leader of the tribe would himself lead the hunt, and would be the strongest, fittest male who had cowed all his rivals?