Excercise helps...also, rather than meditation/breathing, I use progressive relaxation--that is, sitting comfortably and conciously relaxing one muscle group after another. Start with your forehead, then the jaw (a biggie), then the neck, the shoulders and so on down your body. What's kind of cool is that if you can remember to do this when you are stressed, pretty soon your body will become conditioned to relaxing on it's own when you get stressed. It was the strangest thing the first time it happened to me...I was all freaked out, and suddenly I could feel my muscles begin to relax...really cool. You can also practice by sitting down and tensing ALL your muscles as hard as you can and holding it for a count of ten, then relaxing as described above. Do this two or three times twice a day...it works wonders! (I learned this in an anger management class, BTW).

Hope this helps,
DJ