Identify the little physiological reactions that you're going to have as that stress starts kicking in. Your heart rate is going to increase, your breathing is going to get heavier or more rapid at least. You start sweating. Maybe you feel a little nauseous. The muscles get tense. These are all things that happen. If you recognize that those things are actually okay, it's pretty cool. Those things are preparing for combat or whatever event that we're going into.