So basically if you are a female boxer vying to get on the US olympic team in Paris you have to overcome someone who is going to be physically stronger than you. They were a man at one point and it's almost impossible for a woman to beat a man in a boxing match. They are basing it on Testosterone level. It really doesn't matter. Swimming, weight lifting, boxing, shot put. If you were born a woman you will lose to a man no matter what changes than man effects to compete as a transgender.
USA Boxing to allow trans women to compete against female boxers
Transgender boxers must meet certain criteria to compete in their desired category, including declaring their new gender identity, completing gender reassignment surgery and regular hormone testing.
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