Why walking may be the key to a long and healthy life

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Throughout history, few things have inspired as much quackery as the pills, potions and promises to slow ageing, boost vitality, or extend life. Yet, amid the hype and hollow claims, a few golden truths remain. As far back as 400 BC, Hippocrates, widely considered the father of modern medicine, famously said, “Walking is man’s best medicine.” More than two millennia later, science is finally catching up with that wisdom.

People who walk more than...