I am mentally and physically fit.

A stuck problem often comes unstuck about fifteen minutes into a walk. Nothing was solved at the desk. The legs did it.

The division between mental and physical fitness is largely administrative, a filing convenience that does not match how any of it works. Thinking happens inside a body that has or has not slept, has or has not moved, is or is not fed.

Which means the most reliable intervention for a jammed mind is often not more thinking. It is a coat, a door, and twenty minutes of going somewhere at a moderate pace.