Yeah it doesn't really mean muscular, just big, but that's the first thing that came to mind.

Corpulent is a pretty good guess, but the meaning isn't what I thought it was. If I don't see anything better posted in a few hours, I'll accept corpulent and mark this solved.

Sinewy? I know that doesn't quite sound right but I dunno, it's a shot.

Is it any of [these?](https://www.wordhippo.com/what-is/another-word-for/well_muscled.html) Burly, maybe?

[TOMT][WORD] A word that sounds similar to "corpuscular" but means muscular.