The Differences Between Men and Women Over 2000 Meters

The sex based differences actually start in utero. Puberty is where there's the explosion of testosterone that really drives the physiologic differences between men and women. Even in girls and boys pre puberty, there are physiologic advantages to boys compared to girls. The differences are smaller, clearly smaller than they are after puberty. You cannot put biological men in women's events and expect there to be fairness. It's not possible.