Walking cuts breast cancer death risk in half

Five hours a week of walking (or any moderate aerobic workout) reduces your risk by more than half, according to a new study from the University of South Carolina. And just 20 minutes a day cuts the risk by a third.

Researchers call their study, involving more than 14,000 women, the first to objectively connect fitness levels and the risk of dying from breast cancer. Will exercise cut your chances of getting the disease in the first place? Other studies say yes—by about 20%.