By Dr. Brian McDonough, Medical Editor

PHILADELPHIA (CBS) – Do you sit most of the day? It is probably not a good idea. You need to get up and around.

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According to Harvard scientists, women who sat for 10 or more hours during the day had a greater chance of heart attack or stroke, especially if they were also overweight or over the age of 70.

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Compared to very active women who sat for 5 or less hours per day, the sedentary women were at 63% greater risk for heart disease.

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There were over 70,000 women in the study, which was designed to review a large number of health and lifestyle issues.