Corporate Athlete

Read a bit of a book about managing your energy. It mentions that we should balance moments of spending energy with moments of recharging.
In a study of top performers in tennis, one of the findings was how the top players behaved in between points. In these 15 second breaks, there was a finding that the really successful players have rituals of behaviour - they seem to use these breaks to relax and recharge.
A famous golf player also said, that his focus increasingly sharpens reaching total focus as he swings. After the stroke, he fully relaxes, lets his mind wander and chats to other players or the caddie as he walks to the next hole. As he approaches it, his focus starts building up again...

By building these little breaks, they manage to extend the periods of high performance. Without these breaks, our mind woul get fuzzier as times progresses and we would get much more tired, much earlier.

And there are 2 key things that influence our energy levels: food and also our breathing.
Personally, I will build short breaks for relaxed deep breathing. A few minutes every 2 hours or so.