"Meathead", "cardio bunny" are words in every day usage. Here is what urban dictionary has to say on meathead :-
meathead
An enormously muscular guy who cannot hold a conversation about anything other than weight-lifting and protein shakes. Gets upset very quickly when he cannot complete his own sentences and thoughts. Can be found at nightclubs wearing shirts that are 10 sizes too small (if at all). They are by far the most closely related human beings to that of apes, chimpanzees, and other primate. They are evolutionary hindered and are less capable of following directions than my dead hampster.
meathead
An enormously muscular guy who cannot hold a conversation about anything other than weight-lifting and protein shakes. Gets upset very quickly when he cannot complete his own sentences and thoughts. Can be found at nightclubs wearing shirts that are 10 sizes too small (if at all). They are by far the most closely related human beings to that of apes, chimpanzees, and other primate. They are evolutionary hindered and are less capable of following directions than my dead hampster.