^That is more of my experience with rugby players, and footballers in general.
American football players tend to go for bulk. Yes, they are massive guys, but I find the lean muscular agility of your typical European player to be far more intimidating than brutish tree trunk sized arms.
I once found myself stuck in the back of a tiny airplane with the Liverpool football team. It was kind of awesome. They were loud and crass, and continually tortured the rather attractive flight attendant with subtle sexual harassments, which she genuinely seemed to really be enjoying. These guys kept ordering gin and tonic after gin and tonic. I decided I needed to see what all the fuss was about. The G&T has been my drink ever since.