Y'know, you're right.
If you go to this link:
http://www.joinarnold.com/en/press/imagecenter.php
And look at the images, Arnold really does look downright thin compared to alot of the people he is standing next to. Maybe it's just the suits, but he looks almost slight in stature.
Judging by those pics, and what we know (having seen in his films) I would say that he is not a very big guy at all, just VERY defined.
Strange...and a bit of a letdown, one of my childhood heroes turns out to be human after all....
yep.
Here he is next to a thin guy, Bill Simon who is on Arnold's right. Bill is 5' 10, 160 Lbs and Arnold has lifts in his shoes. (I don't know the dark hair guy)