Anthropologists estimate that early man walked twenty miles a day. Mental and physical benefits have been attributed to walking as far back as ancient times. The Roman writer Pliny the Elder (23–79 AD) described walking as one of the “Medicines of the Will.” Hippocrates, the Greek physician, called walking “man’s best medicine” and prescribed walks to treat emotional problems, hallucinations, and digestive disorders. Aristotle lectured while strolling. Through the centuries, the best thinkers, writers, and poets have preached the virtues of walking. Leonardo da Vinci designed elevated streets
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