I think it’s more about the spirit of having a break, not necessarily actually going for a walk.
When taken as a metaphor, rather than as verbatim advice, it’s practical and easy.
I write a stretch, and then catch up on Snapchat stories from my friends and people I follow. I go back writing, and take a break by editing something else.
Yes, taking a walk in nature is great: it’s healthy and I cannot recommend it enough. Even if it’s for five minutes in a park in the middle of a busy city, it’s worth every second of it. I aim to do it as much as I possibly can.
That said, “taking a break” doesn’t have to be a nature walk, or even predicated on “finding a lull moment”. I completely believe, because I’m actually deploying it in my own life, that being productive in a different way serves just as good as taking a traditional break:
Although yes, absolutely go for a walk in the woods if you can. 😉