This is one of the wittiest responses ever, IMHO!

Hi Audrey,
You have already received a lot of great advice on the technicals and shooting locations - one additional thing to consider is the height of your vantage point. I find that sometimes kneeling can improve sports images as many players keep their heads down. Not as critical with girls LAX as they do not wear helmets, but I usually bring a small garden kneeling pad as our Oregon springs are typically very wet! Good luck and have fun.