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Katie Couric's Notebook: Exercise And Cancer

By Katie Couric

May 13, 2008 / 5:59 PM EDT / CBS News

Video:
Notebook: Exercise And Cancer

We know that exercise can keep you healthy. But some news out today indicates it can do it in ways we never imagined.

The Journal of the National Cancer Institute reports that you can protect yourself from breast cancer by starting to exercise while young.

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