As I'm now somwhat disabled, I can't take part in martial arts, or running (which was a passion).

I get rid of the stress by reading (and writing very bad poetry). And sometimes, when frustrated by some code that looks plausible but doesn't work, by thumping the screen or walking around the building. I can tell when I'm stressed by noticing when my fingers start to drum on the desk.

Amazing how much comes out of you through the pen to paper... Typing it doesn't do it for me, I love the process of physically writing, crossing out, inserting, changing. Once I'm mostly happy, then I'll type it up.

Oh, and watching Doctor Who, via the BBC's excellent iPlayer...