All female sports and their locker rooms and restrooms must be reserved for biological females only.  Biological males already have their own restricted sports programs.  Females deserve to also have their own restricted sports programs and reserved locker rooms and restrooms.  If this doesn’t happen, biological females will no longer have an opportunity to succeed in their sport or feel safe in their locker rooms and restrooms.  
If transgendered athletes refuse to play on teams that match their biological gender, they could create transgendered teams and play against each other, leaving the true men’s and women’s teams to play on teams composed of only biologically determined teammates.