I just found a scientific researh paper which conlcudes that "Women have, on average, about 17% more muscle mass than men" and that "women tend to have more muscle mass than men, which is why female athletes are often stronger than their male counterparts". At first I didn't believe it, it didn't seem right, I mean men are stronger than girls, right? That's what we are taught after all.

After doing hours of research and tried to decipher the study I think I understand. Yes, men are generally stronger, but because they are generally bigger, heavier. However, if we take a girl and man who both weigh the same, say 130 pounds, who have the same genetics, receive exactly the same training, ceteris paribus i.e. all other things being equal – the girl will have 17% more muscle mass, thus she will be stronger and faster.