Why does Muscle man's belly show and his shirt doesn't cover it?

Cuz he's fat
He's lazy and doesn't wanna put it down
The creators decided it
The creators decided it cuz he's fat
He's overweight and can't do anything about it
That looks funny on overweight people in cartoons
The makers and person who created the show wanted it that way
That's how it is
All of the above
None of the above
Something else