If I look back at my career, the best moments are when I repeated what I did in high school — focus on systems, not goals. If I focused too much on where my startup would be when I wanted it to be there, I was miserable. When I focused on just showing up, learning as much as I could, delivering things our customers wanted on a regular basis, I enjoyed it, and we still got great results.
One of the best and most practical breaks is walking. For cerebral work, just a 5–15-minute walk has been shown to increase creativity. For physical work, a brief walk encourages one’s heart-rate to come down while keeping blood flowing and the body limber.