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I thought that number was arbitrary
The widely used target of 10 000 steps a day does seem to originate from a successful Japanese marketing campaign in the mid-1960s. A company called Yamasa wanted to capitalise on the popularity of the Tokyo Olympics and designed the world’s first step counter, a device called a manop-kei, which translates as “10 000 step meter.”
So, there was no real evidence?
Not at the time, …