Turns out that there has never been any evidence that 10,000 steps is the magic number for health. It is a nice round number, but that is about it. The Japanese guy who designed the current pedometer came up with 10,000 in the 1960's.
Now there's good news. In the New York Times, Gretchen Reynolds is reporting a hefty new study with plenty of people and an impressive timeline.
There is a "sweet spot" around 4,500 steps that confers big benefit.
Great news.
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