It was pretty daunting. Normally, I never go to a gym, but before we started shooting, I thought I'd better. I reckoned I was in really good shape, and then I looked around and I was half the size of everyone else. A lot of these American actors have this - in my view - misplaced view that they have to look like Action Man. The trouble is, they all run the risk of being interchangeable. - Damian Lewis