Your brain will implode
Mr. Lundgren was an almost-superstar back in the '80s, having played comic hero The Punisher (1989 version) and even He-Man (1987). But, his greatest acting accomplishments is beating Apollo Creed into something resembling grape jelly and inspiring the greatest Rocky montage of all time.
As it turns out, this towering blond monster who casually told Sylvester Stallone, "I will break you," could have, in fact, probably calculated the amount of effort (in force pounds per square inch and Joules expenditure) needed to do just that in his head.
The man reportedly has an IQ of 160. He graduated from the Royal Institute of Technology in Sweden, got his master's in chemical engineering, then was awarded a Fulbright Scholarship to MIT. After just two weeks of that, his superhuman intellect allowed him to calculate that a life spent inventing life-saving chemicals would mathematically contain less awesome than one movie spent playing He-Man.
Hey, did we mention that he speaks five languages (French, Swedish, German, English and Italian)? Or, that he's a Pentathlon Team Leader and a former Ranger? And a third-degree black belt?
So, really, to play a superhuman machine of destruction in Rocky IV, he still had to tone it down quite a bit. Hell, this man had to tone it down to play He-Man.