I jokingly did a Random Talking Video a while back dishing out the two secrets to being a great writer.
First, put on a sweat every day.
Second, find yourself a creek or river you can sit by as you contemplate things.
I had just finished a morning of writing and spent an hour mowing the lawn under the sticky Carolina heat.
When you are doing any type of creative work, there isn't much physicality involved. This isn't about health; it's about shaking yourself from the flow now and again.
You know: getting out of your head, doing something other than staring at a blank page now and again.
I suggest sweating, any way you can get it. Fight, flight, or fuck.
There is no shortage of writing through the ages about the creative and intellectual benefits of taking a walk.
Alistair Humphreys is an advocate of taking mini-adventures to find something thrill-worthy in your own backyard.
Chuck Palahniuk is on record saying he writes until he finds himself stuck on something, then he puts in a rigorous endurance workout. Usually, the shower afterward unlocks whatever it was he was stuck on in the first place. I would link to where I read this, and I'm certain it was him, but the text is lost somewhere in the infinite, poorly cataloged archives of the internet.
If you have the legs, you must move them.
If you have sweat glands, why not see what it takes to trigger them?
Flush yourself out, take on a new shape, feel a different type of anxiety for a little while.