DENVER — There is a new study in the British Journal of Sports Medicine that suggests 4,000 steps a day at least three times a week could be enough to lower your risk of death by up to 40% .

This is very different from the 10,000 steps we've all heard about. So Denver7 asked Dr. Scott Joy, the chief medical officer at HCA HealthOne, how it can drop so dramatically.

"When you look at the history behind that, it actually was a marketing ploy," Dr. Joy said. "That it was actually a marketing number that someone threw out who had a pedometer, rather than based on any science. So as we've gone back and studied this, we're putting little more solid numbers to the step counts."

Researchers came up with different numbers.

The British Journal of Sports Medicine study, which primarily focused

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