Depression and Exercise.

I'd always heard that there was some sort of link between exercise and alleviation of depression, but I wasn't quite sure what it was. Well...I still don't know, but that article does have a few interesting theories, chief among them being this one:

"Some research indicates that regular exercise boosts body temperature, which may ease depression by influencing the brain chemicals."

Hmmmm. This might explain why I feel lighter in summer and more depressed as the days get shorter.