Walking raised creative output by about 60% compared with sitting.
Even on a treadmill facing a blank wall.
Marily Oppezzo and Daniel Schwartz at Stanford tested people on creative tasks while sitting and while walking. Creative output rose by about 60% on average when they walked.
Steve Jobs held serious conversations on foot, Beethoven walked every afternoon with a pencil ready. The study measured idea generation, not decision quality.
Three divergent-thinking experiments with students, Journal of Experimental Psychology, 2014.