" Submarines are the worst. Even the largest feel cramped. The last time I was aboard one, we weren’t even allowed to work out. The gym was located on the other side of the nuclear reactor from our quarters, and we weren’t authorized to pass through the reactor area to get there. Aircraft carriers are a hell of a lot larger, but they can be just as boring. At least they have lounges where you can play video games and there are no restrictions on getting to the gym to blow off steam. In fact, on one occasion, we were specifically requested to go to the gym by the CO. We were on the Kitty Hawk when they were having a problem with gangs. Apparently, some punk sailors who were gang members were causing quite a discipline problem aboard ship. The CO of the boat pulled us over and told us when the gang used the gym. So we went down to work out, locked the door behind us, and fixed the gang problem. "
― Chris Kyle , American Sniper: The Autobiography of the Most Lethal Sniper in U.S. Military History