why are boys considered stronger?

Answer 1

Boys are usually considered stronger than girls because you see many men and boys that work out, and then gain muscles and such, and many people believe girls to be "angelic, frail, and graceful" because of our looks and because we are girls, when that isn't true at all. In fact there are many women bodybuilders who've won bodybuilding contests, workout and gain muscles and such too, but it has because a default stereotype that men are stronger than women, only because it has became natural to see more men with a built form than women. That's my take on it at least! :)