In the same way, I've found that I actually fidget less if I'm standing. That's because the very act of being on your feet requires that you activate major muscle groups to hold your body up. Standing also means you're continuously performing tiny movements to keep your balance, another source of stimulation. When you sit, it's easy to relax nearly every part of your body, and pretty soon you find yourself tapping your feet just to satisfy the desire to move. Deer pick up on that from hundreds of yards away. They are less likely to notice some other types of physical movement that help keep you alert. You can slowly chew gum, gnaw jerky, or munch sunflower seeds without giving away your position. You can do isometrics, tensing and relaxing your back, legs, arms, and stomach. I've never found these helpful for keeping warm, but you can return home with improved muscle tone. When swimsuit season comes and young ladies admire your six-pack abs and ask where you got them, you can proudly respond: "Hunting." You've got to keep your mind moving, too. If you've got a rangefinder, busy yourself documenting just how deficient your depth perception is. But the best mental exercise is to constantly scan the woods and ask yourself where a deer is most likely to show up, and then decide how you're going to respond. What's the range? How long will the deer be exposed enough to take a shot at it? Which way is it likely to move? How are you going to get your gun or bow into position without spooking the animal? Run the scenarrio through your mind, even to the point of slowly-very slowly-raising gun or bow and taking the imaginary shot. Then do this for the less likely spots, which is probably where the deer will actually show anyway.