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The article discusses a study published in the "Journal of the National Cancer Institute" which shows that exercise during the teenage years can protect girls from breast cancer as adults. Questionnaires were sent to 65,000 nurses aged 24 to 42 who were asked about their physical activity from age 12. It found that women who were active as teens and young adults were 23% less likely to develop premenopausal breast cancer, with regular exercise from age 12-22 having the biggest impact. The theory is that physical activity in youth lowers estrogen levels.