It is exercise alone that supports the spirits, and keeps the mind in vigor.

Thinking is done by a body, and a body that never moves thinks worse. Energy, patience and the ability to hold a problem for an hour all depend on physical condition more than most people want to admit, which is inconvenient for anyone who works with their head. There is nothing mystical in the connection. A used body sleeps better, and most of the rest follows sleep.

Put movement into the part of your day where you currently make excuses, and keep it small enough to survive a bad week. Walking counts. Judge it by how your afternoons go rather than by what it does to your shape.