A lot of the stuff you do as an actor - or I do, because I can't speak for everyone - is not always consciously thought out. A lot of the time, for me, it's actually just feeling stuff, and it happens all in the moment and your body reacts.
Henry CavillA large amount of constant activity will get things going. For example, training in the morning will have everything, all the juices flowing by the time you actually get to work. So, when you're at work, you've been already up for an hour or so or two hours, and you're raring to go where everyone else is still wiping sleep out of their eyes.
Henry Cavill