In fact, there’s one activity that is almost tailor-made to work [at helping you distance yourself from a problem you’re working on]. And it is a simple one indeed: walking (the very thing that Holmes was doing when he had his insight in “The Lion’s Mane”). Walks have been shown repeatedly to stimulate creative thought and problem solving, especially if these walks take place in natural surroundings, like the woods, rather than in more urbanized environments (but both types are better than none—and even walking along a tree-lined street can help). After a walk, people become better at solving problems; they persist longer at difficult tasks; and they become more likely to grasp an insightful solution… And all from walking past some trees and some sky.
Konnikova, Maria. Mastermind: How to Think Like Sherlock Holmes. Penguin; New York. 2013. p.134