It's been a long, long day. You skipped lunch, ran 50 errands, and now you realize that your whole head is aching, you are seriously cranky, and every muscle in your body is sore. Your life, as they say, is out of control. But that doesn't mean you have to suffer. "There's a lot you can do to relieve stress, even in a single moment, if you prepare yourself," says Herbert Benson, M.D., director emeritus, Benson-Henry Institute for Mind-Body Medicine at Massachusetts General Hospital. Next time you're feeling frenzied, frustrated, and fed up, try one of our instant serenity tips.