Movement reminds the mind that it lives somewhere physical.

Thinking can go on for a long time without any awareness of the body it is happening in, and moving is what interrupts that. A walk, physical work, anything that requires your limbs, returns you to the fact of being somewhere, and problems that seemed enormous inside your head shrink on contact with a street.

When you have been stuck in your own thinking, go outside and move for twenty minutes without a device. It is not a metaphor. It reliably changes what you are able to think.