Turn off the TV, close up your computer, put down your knitting, and get some exercise! Doing a brisk walk 3 to 5 hours each week or any kind of physical activity 30 to 45 minutes at least five days each week lowers your estrogen levels and improves your overall health. Combine that with eating a healthy diet, and you can lower your risk of breast cancer, as well as extend your life, if you're a survivor. Being sedentary increases your risk of several kinds of cancer, and may lead to obesity. Learn how exercise and diet protects your health.