"Male puberty makes you taller, confers greater muscle and bone mass, larger heart and lung capacity relative to your size, and more hemoglobin...."

"Most people will never have what it takes to compete at the elite levels of high school, college or professional sports. That’s not an argument for kicking the genetically blessed out of the league so that those of us who are slower and weaker can experience the thrill of victory. One might add that it is particularly not an argument for kicking out people who face as many other disadvantages in their lives as trans athletes do. But if you like that answer, you should probably ask whether women’s sports should exist at all. After all, we didn’t create separate leagues to reinforce the special feminine identity of female athletes; if anything, women’s athletics was supposed to break down such divisions. The separation is a nod to biology: After puberty, biological women can’t compete with similarly gifted biological men.... [Do we] think it’s important for cisgender women to have a place where at least a few of us can experience the thrill of victory. Maybe that isn’t an important social goal. Or maybe it is, but just not as important a goal as trans inclusion. Either way, that question will have to be asked and answered — out loud, where everyone can hear it."

Writes Megan McArdle in "We need to be able to talk about trans athletes and women’s sports" (WaPo). 

The easiest solution is not to talk about it. Not only does it seem undesirable to say anything that could feel hurtful toward transgender people, but it's also quite unpleasant to need to say anything about the physical inferiority of women. The only way even to consider excluding transwomen from women's sports is to forefront the athletic inferiority of the female body. To have this conversation is to be transformed into a bunch of Bobby Riggses. But to fail to have the conversation is to say we don't need a special category for the female body and the whole women's sports movement was about nothing.

I thought maybe it would facilitate the conversation to speak of "the female body" instead of "women" or "ciswomen" or "natural women." As McArdle points out, women's sports isn't about how much "like a woman" the athletes feel inside. Indeed, it seems probable that many of them don't identify with what the culture traditionally considers feminine. And the women's sports movement was about transforming traditional gender roles: You could feel very very boyish and you're as womanly as the girl who revels in girliness. Isn't that the ideology of the women's sports movement?

The separate category exists because of the bodily differences and not at all because of inward feelings.... or does it? Maybe sports is really only about how people feel inside. You have to do something outwardly for it to be sports, but you do it for the feelings. If the women's sports movement was about boosting the feelings of women — women, who are inherently inferior at sports! — then how can you turn around and be unkind to the transgenders?