I have coached several teams, boys and girls … let me tell you this, i did not see a girl or boy go from the bottom of the team (athleticism and/or skill wise) to the top. That said, some of the kids that were in the middle of the pack worked on their game brought it to a higher level. But the athletes are athletic at an early age and generally stay at the top unless they leave the sport. I know there are exceptions, but this is just my experience.