That’s great, she’s probably on the far right of the athleticism spectrum within the female sex. But the comparison with you is absolutely irrelevant, because, and I say this factually, you’re not an elite athlete. How does she compare to the top 10% of men? Nothing sexist here.

So the thing for your sister is that if you got your wish, the only sport she could ever do is play it socially against (and again, I’m being blunt here) mediocre males like you. The moment she stepped on a court or track, or jumped in a pool against top 10% males, she’s nowhere

And if that still seems sexist to you, spend some time on wiki and compare world records in track and field, swimming, weight lifting, cycling. Or even high school records. NCAA winning times. Take your pic. Check how many males are far ahead of the best females in history.