It's really a combination of both, the girls that get good instruction then practice what they have been taught are going to have great success! You can't really have one without the other. Years ago (no disrespect) we didn't have to be as good to be at the upper end of hitting, today you know instantly the one that truly work at there craft. Watch college games and see all the home runs is it the bats or all the time these young ladies have put in? Not very many pitchers do it on there own, they have instruction and practice a lot same for good hitters.