>>34658
>I assume it's because of how /fit/ girls aren't really popular all over the world
FTFY
Then there's the fact that /u/ isn't that popular either when compared to non/u/, making it even less likely to find works that overlap and have /fit/-/u/ characters. There will never be a chapter 2 of Tsubakame!
Still, there's a few dedicated /fit/girl artists but it seems like they'd rather draw muscles on some other girl than the actual muscular girl in the series.