This question stems from a comment made by a Cleveland Brown's coach on the TV program Hard Knocks. So it's semi-joking/meme based but also something I'd genuinely want to know more about. From what I remember of Band of Brothers, it was mostly a lot of running and hiking.

Also of interest is how did it compare between jobs, like infantry v paratroopers v tankers v artillery. And how did it compare to what the British, Nazis, Soviets and Japanese did.