Reposting an old thread of mine to say as a former college athlete, I want trans girls and trans women to be able to participate in sports. Let them run, let them swim, let them play.
Also to any politician who says "well, but sports" - trans people should be able to participate fully in sports, because trans people are people. Trans kids are kids. And excluding trans people and trans kids from sports turns them into second-class citizens and that's unacceptable.