The mind thrives at three miles per hour, the speed of a moderately paced walk. Freed of the pettiness of the office, the tyranny of expectations, it roams, and when the mind roams, unexpected and wonderful things happen. Not always, but more often than you’d think. Walking supplies just the right balance of stimulation and repose, exertion and idleness. When we walk, we are simultaneously doing and not-doing. On one level, our minds are engaged: focusing on the terrain ahead, cognizant of the periphery. Yet none of this thinking occupies much cerebral space. There’s plenty left over for
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