Health: 10,000 Steps

How far do you really need to walk every day?

It seems that anywhere you turn these days, people are wearing pedometers--you know, those little pagerlike devices that attach to your waistband and count the number of steps you take? The American Diabetes Association has packaged one with its new book on the benefits of physical activity, Small Steps, Big Rewards, and McDonald's is offering a free one with its new Happy Meal for adults, which is being test-marketed in Indiana.

How many steps should you rack up? The figure you see most often is 10,000 a day. That's a nice, round number, based on Japanese research showing that it...

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