Exercise for teens may prevent breast cancer

Prevention. There's nothing like it. And what great news it is that girls as young as 12 can already start protecting themselves against breast cancer.

Just like middle-aged women are encouraged to work out to lower their risk of developing this disease, new research concludes that exercise during the teen years can prevent breast cancer in later years.

So here's the scoop: Women who were physically active as teens and young adults were 23 percent less likely to develop pre-menopausal breast cancer than women who grew up sedentary. Having the biggest impact was regular exercise between the ages of 12 to 22. And the women with the lowest risk reported running or exercising vigorously three or more hours per week. Although post-menopausal breast cancer was not studied, it's likely exercise helps all the same.

Time to get your daughters off the couch!