There have been some good suggestions here, like taking a walk or working out, which I like, hence I use the bowflex to get my fatt ass in shape. Meditation seems to work for me. Another thing I do is to start off playing really, really tight. Almost Phil Hellmuth top 10 tight, and then, as the game goes on, gradually loosening up. This has the aditional benefit of allowing you time to size up your opponents as you're not playing many hands and give those who may be paying attention to you the impression that you're a rock, so you can pull off bluffs later.