Out of curiosity, how much running do you do Evilcyber?
And are you more of a long/short distance runner, or do you just do it for fitness/similar?
At the moment I do it just for fitness. After a stressful day there's to me nothing better than getting into your running shoes and run.
I played with the thought of training up for a marathon, but haven't decided yet, because I'd have to change my whole training significantly.