Back in the day I had a very stressful job for a couple of years. It was enough to make anybody tear their hair out, which may explain my present tonsorial splendour.
I had an hour for lunch from 1 to 2 o'clock and I spent the whole time walking. The more stressful the morning the faster I walked and the further i went. By the time I got back all the stress was gone and it was like starting the day all over again.
Exercise -- in this case, walking -- does it for me.