Then how do you explain his freakish strength?

5 seconds sound clip from the Rocky IV (1985) movie soundboard.

You can hear this line at 00:11:48 in the Blu-ray version of the movie.

Quote context

[...]

- Well...

- If I may answer. It makes a man a better man, a great athlete, a super athlete by harnessing all his strength.

- Though most of the world is ignorant in body chemistry, we wish to educate your country.

- There have been rumors of blood doping and widespread distribution of anabolic steroids in the Soviet Union.

- Has Drago partaken in any such experiments?

- No, no. Ivan is naturally trained.

- Then how do you explain his freakish strength?

- Like your Popeye, he ate his spinach every day.

- Shall we have a demonstration?

- Please do.

- Thank you.

- A normal heavyweight averages 700 pounds of pressure per square inch.

- As you can see, Drago averages 1,850 pounds, so the result's quite obvious.

[...]