No, you’re seriously going to argue the point that Yuu doesn’t count as a “sporty” girl in the context of this series?
Except for some inferences about her home life and the fact that she reads manga and listens to pop music, that’s pretty much all we do know about Yuu’s past before the series begins—that she was a dedicated member of the softball team who was considered a reliable senpai by her juniors. We see her go unwind at a batting cage with Maki, and she’s a pretty decent bowler. (She’s a little short to be outstanding in the relay races, but she does okay there too.)
Or is this just about mincing words?
I mean the original point you were making is that I was stereotyping sporty girls as lesbians, and my counter argument is that I was suggesting that she was just one of a few "sporty" girls, most of whom are definitely straight. I don't know how serious you were being, but I kinda resent the implication a little.
With Yuu, the only point I was actually making is that when you said "sporty", she didn't immediately come to mind for me. It's about how I personally use the term. She's an avid reader who works in a bookstore, and she's in stuco as well. She's also a jellyfish geek. She's physically active, sure, but she engages in a variety of activities. Sports isn't her "thing" like it is for Serizawa, Natsuki, and Akari. If you want to call that sporty, okay, sure, but that's a pretty broad term, then.
If I was going to describe Yuu, the term that comes to mind for me is something more like "well-rounded".