Whether or not they always succeed in adhering to the philosophy, the Pittsburgh Steelers as an organization ascribe to the precept that football is in essence about being physical. If you can out-physical your opponent, you have a good chance of winning.
It was Jack Lambert, after all, who authored one of the most famous quotes on the subject, part of which was even turned into the title of a book. “I believe the game is designed to reward the ones who hit the hardest—if you can’t take it, you shouldn’t play”, he is known to have said.