I did this last summer. Simply walking early to get some bread. It quickly turned into an automatic alarm clock, gave me a good 30 min of "warm up" walking that also let my brain coast while watching the woods. You come back both refreshed and all warmed up blood wise. It was very very beneficial altogether.

If it wasn't for the wrong job I took next and winter killing the morning sun I'd still be doing this. Actually now that spring is here, I feel the need. The need for .. walk.