My gym time is diminished because a year and a half ago I moved a considerable distance from where I then worked, and still a bit further from where I now work.

My gym time is diminished because a year and a half ago I moved a considerable distance from where I then worked, and still a bit further from where I now work. However I typically run 6 miles a day during the week at around 9PM, which serves the same purpose. What it really comes down to me is a few things: 1) It forces me away from the computer for about an hour a day. 2) It clears my head from the day, and prepares it for tomorrow. I find that also helps me sleep better as I'm not cycling through things in my mind. 3) It is good exercise. I've never been fat, but it keeps me fit and that in and of itself makes me feel better I think mostly its just something that doesn't require me to be wired in and hyper vigilant while doing, which I feel managing/coding/reading/hacking does.