What the plus size fuck?
Lemme bust a big guy myth here. Once you're past (at worst) the age of 21, "don't know your own strength" is complete and utter bullshit.
By then, you've known your own strength for years. You've busted your share of desks, flatware, and all manner of stuff. Join the debate team and wanna thump the podium? It wasn't a collapsible podium before you got there, kid.
Then high school happens and puberty moves you up from "extra large" to "oh my God." Then you start breaking shit in ways that bend the laws of physics: car doors, industrial equipment, The mind boggles. Just being in the room with your big ass voids warranties.
And don't even ask about sex.
By the time you're old enough to legally drink, you've adapted. You do things a certain way because careful beats clumsy. But you can still go full force when needed.
Doesn't know his own strength, my ass.