@Suben Not gonna disagree with you on that; I'm just saying that I don't think they're particularly chubby (not a native speaker, so I interpreted "chubby" in an "unhealthy" kind of way, maybe I was wrong, in which case sorry u_u) or big. Many girls doing martial arts I knew had a similar body type, I think this comes from working on your lower body and lowering your center of gravity.
But I agree, having read further thanks to the Spanish scans, the author draws characters with different body types. And, from what I know, realistic ones. 'kinda refreshing, tbh. ^^