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Need another reason to push yourself harder?

Researchers at the University of Southern
California found that women who did high-intensity sessions, such as
swimming or running, for at least five hours per week had a 20 to 30
percent lower risk of breast cancer
than women who did more moderate
activities (like walking) for less than 30 minutes a week. "Strenuous
exercise can lower production of estrogen and progesterone," says lead
researcher Leslie Bernstein, Ph.D. "Increased levels of these hormones
have been associated with a higher risk of breast cancer." To make sure
you're hitting the mark, spend half of your weekly cardio workouts at
RPE 6 or 7 (see below for RPE chart).

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