You'll find the boxers, highschool football stars, wannabe dancers, retired army guys and good old fashion meat heads all in the busted industrial buildings outside of town. I really don't think some guys can be cashiers or waiters because they would hulk the register out, like putting a bear in a cage and poking it. They don't know how to hold that energy back.
I think it would be much harder for a cube slug to do much. He might get something going if he's overall happy and healthy, which is rare in the people who's asses wouldn't see sun even if they were nudists. Aside from proverbially trying to putter out like a rusted out car, the cube crowd seems to have no clue how or why to do workout or diet.
They ask such wide-eyed platitudes like "what suplument's should I buy" with the same baffling ignorance I ask "I saw a C++ book on my brother's shelf, is that computer stuff or something?"