In the past 100 years or so, there were very tightly defined male and female roles and activities. Traditionally, boys were taught how to throw, run, fight, ect. by someone who had been taught previously and so on down the line. Girls, on the other hand, were taught to sew, cook, keep house, and raise children. If they stepped outside what was considered the norm, and tried some of the 'male' activities it could be expected that they couldn't perform at the same level as boys because they were never taught.
These days, gender roles are not nearly as defined when it comes to the aforementioned activities. Girls are participating and excelling in what used to be male dominated sports. If I were told I threw or ran or fought like many of todays female athletes, I'd be pretty proud of that fact.