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Breast cancer is the leading cause of cancer deaths among women, according to the American Cancer Society. The group estimates about 465,000 women died of breast cancer globally in 2007, and 1.3 million new cases were diagnosed.

According to a new study, vigorous exercise can cut the chances of developing breast cancer by almost 30 percent. That’s a good news for the women who stay in shape.

National Cancer Institute scientists, led by Michael Leitzmann, studied 32,269 postmenopausal women for 11 years. They determined vigorous activities included such tasks as scrubbing floors, chopping wood, digging, fast jogging, competitive tennis, bicycling and even fast dancing.The study showed that strenuous activity (and that includes everything from scrubbing floors to running) reduced the risk of breast cancer by 30 percent.

“We know that being overweight puts women at increased risk of breast cancer,” said Michael Leitzmann, who led the study. “What our study shows is that even among women without this increased risk, if they exercise they can get some benefit.”

So women should take more vigorous exercise for a healthy life from today.