I guess when I say “beefy” I mean “beefy for Cobra Commander”. Like that figure was significantly more jacked than the old hyper-skinny CC without being Big Boa or anyone like that. Also I think he canonically wears body armor (with the equivalent stopping power of the Battle/Combat Armor in streamlined form) underneath that uniform/hood, so he’d be more padded.
So, like, not a bodybuilder AT ALL, just “ahh you can see he works out and yeah maybe he’s wearing lifts but *damn* he’s a scary guy” vibe.
Also re: the Joker:
I definitely prefer the 1940 version who could kick Batman in the head and knock him off a bridge. Not a huge he-man, but not a scrawny dude either. Scrawny is for Riddler and Scarecrow. There was a 90s comic where Joker was showing someone the tricks of his trade and he got shirtless to demonstrate something and he was like Brad Pitt in Fight Club plus about 5-10 pounds of muscle but leaner overall, and that worked for me. Like Joker sometimes feigns combat incompetence, but he’s a brutal and skilled fighter who absolutely practices his own take on “martial arts”. Joker, Penguin (a self-trained boxer and master swordsman) and Two-Face (a collegiate boxing champ) are all underrated hand-to-hand combatants.