Study links moderate exercise to lower risk of breast cancer
"Among the women who reported walking as their only activity, those who walked at least 7 hours per week had a 14% lower risk of breast cancer compared to those who walked 3 or fewer hours per week. The women walked at a "moderate" pace -- about 3 miles per hour. The most active women -- those who walked and did more vigorous exercise -- had a 25% lower risk of breast cancer compared to the least active."
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