At my school girls can play tackle football. I'm already going to the weight training for my school. Definitely ask. For my schools and a few others if the sport isn't the same girls can do what they want. Ex: girls and boys basketball. Same concept, same game so they separate it. My school has a tackle and flag team. Not the same sport, different concepts so girls can do whatever. Especially since there is no option for girls go for it. Be confident, and show the coach you're serious about it.
