Exercise helps no matter how old and out-of-shape you are when you start according to a new study. NBC's Chief science correspondent Robert Bazell reports in the video below on a the Physician's Health Study - a study following more than 20,000 male doctors over a 25-year period - that found the benefits are greater than even previously thought. Bazell also notes earlier studies that have found that exercise even helps people add the cellular level. You can also read about the study here.



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