“I think that I cannot preserve my health and spirits unless I— Henry David Thoreau, “Walking, and the Wild”.
spend four hours a day at least — and it is commonly more
than that — sauntering through the woods and over the hills
and fields, absolutely free from all worldly engagements. […]
the walking of which I speak has nothing in it akin to taking
exercise, as it is called, as the sick take medicine at stated