About 5 million people died in 2008 from diseases related to a sedentary lifestyle, and about 1.5 billion people worldwide do not get recommended amounts of physical activity, according to studies in The Lancet. Inactivity is a risk factor comparable to smoking or obesity, researchers said, and is estimated to cause 10% of colon and breast cancers, 7% of type 2 diabetes cases and 6% of heart disease cases. More than 500,000 lives could be saved each year if inactivity was reduced by 10%, researchers said.

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