Relating to: designating athletic sports and teams operated or sponsored by public schools or private schools participating in a parental choice program based on the sex of the participants.

AB 100 requires public and participating private schools to designate athletic teams and sports as "males" or "females" based solely on the sex assigned at birth (as recorded on a birth certificate). It prohibits students assigned male at birth from participating on female-designated teams or using female-designated locker rooms. The bill allows students denied participation or harmed by violations to sue for relief, and gives schools legal recourse if they face penalties for following the policy. This directly affects student athletes in school sports programs and defines participation eligibility based on biological sex at birth.