All depends what I'm angry about really.
But a work out, talking to myself or the dog (the cats never want to hear my issues apparently), I write it down too. I'm a terrible emotional water (so will try everything before I do that one though). Mostly though I can let go of the anger and move forward when I am able to pin point why I am angry and why I am letting myself be so affected by it.
What is currently making you angry?