Once I skip one or two meals, work long hours, or stay up late, my life starts spiraling out of control. So I live on a fixed schedule now, which includes three hours of exercise per day:
* One hour of swimming at 7AM; this forces me to get out of bed on time, and makes me hungry for breakfast.
* One hour of rowing at 5PM; this forces me to stop working, and makes me hungry for dinner.
* One hour of running at 11PM; this forces me to stop whatever I am doing that evening, and gets me tired for bed.
(In addition I have hundreds of small rules: never go shopping alone, the bed is only for sex and sleeping, dinner must take at least fifteen minutes to prepare, ...)
It does take a lot of time and self discipline (and monitoring by others), but it sure helps me to keep my life under control.
Personally, if I'm exercising and can keep an internal thought dialogue, I'm not exercising hard enough. Then again, I've been a runner all my life, and we runners take great pleasure in feeling pain and finding that point where we just can't mentally take it anymore.
Bottom line though, exercise is bar none the single best thing you can do for personal health and sanity (after a good night's rest of course)
This article just reminded me I wanted to raise the question here, but I don't think it warrants its own post.