I tries out for my varsity footbal team back in 1980. After going to summer camp and running my butt off I was told by the coach that no matter how good I was I would never make the cut. Hurts to this day. My son plays JV and Varsity as we have a small town school. He is 5'4" and weighs about 140. His team is 4-1. I am so proud of him I walk 10 feet taller when he takes the field. If your girls have a true desire to play than by all means let them. Around our district there are a couple of girls on different teams. They are not treated any different that I can tell and they hit like the big guys. I think that if they can make it through camp than they have earned their spot.