" The two-point rhythm of walking's stride clears the mind for thinking. (N.B.: Perhaps, after telling the spinal circuits to "take a walk," the forebrain shifts to automatic pilot, so to speak, freeing the neocortex to ponder important issues of the day.) Many philosophers were lifetime walkers, who found that bipedal rhythms facilitated creative contemplation and thought. In his short life, e.g., Henry David Thoreau walked an estimated 250,000 miles--ten times the circumference of earth. "

― David B. Givens , The NONVERBAL DICTIONARY of gestures, signs and body language cues