Taking very cold showers or baths. You gradually decrease the temperature of your shower over several weeks. I can now take a shower or bath with the water on just cold. Other people use ice to lower the temperature of their baths even further.
Some claim that it has significant health benefits, but I haven't noticed any although I haven't been doing it for very long. Still, it's neat to be able to modify your body to tolerate something that would have previously caused unbearable pain.
Here is some discussion of cold thermogenesis on a paleo website.
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Edting software recommendation: If you're a Linux/FOSS guy (a lot of the LW crowd is), Cinelerra is a really good thing to learn how to use. The learning curve is a bit steeper than some other stuff, but the power and flexibility that comes with it should benefit you down the line when you're working with more complex stuff