Almost 94,000 women are enrolled in the Women's Health Initiative
Observational Study. For an average of nearly eight years, they
have answered annual questionnaires about their health and
activities. Based on the data, researchers have found the
Physical activity is associated with a 30%–40% reduction in
risk for heart disease. Strenuous exercise and brisk walking
(about one mile per 15 minutes) confer the same degree of
Breast cancer rates are 18% lower in women who walk briskly
for 1.25–2.5 hours per week and even lower for women who
briskly walk 10 hours or more per week.
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