Where did the 10,000 steps per day target originate?
The 10,000 steps per day target originated from a marketing campaign for a Japanese pedometer called the Manpo-kei, released in 1965. The name translates to '10,000-step meter,' and the number itself was not derived from any scientific research at the time.
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This is one answer. The complete system — the psychology, the biology, and the method — is in the book.
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