Vigorous exercise seems to protect against the development of breast cancer in normal-weight postmenopausal women, US research shows.
Regular activity such as running, aerobics or even heavy housework was associated with a 30% reduced risk of developing the disease, a study found.
Strenuous activity was only protective in women who were not overweight or obese and light exercise had no effect.
The 11-year study of 32,000 women is published in Breast Cancer Research.
Women were asked to fill in a detailed questionnaire about how much and what physical activity they did. - BBC
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