Exercise and Breast Cancer Risk

Vigorous exercise can cut the risk of breast cancer in normal weight women. Non-vigorous exercise has no effect on breast cancer, and vigorous exercise on overweight women has no effect.

Vigorous exercise would be activities such as scrubbing floors, jogging, running, dancing, and biking.

Non-vigorous exercise and vigorous exercise on obese women still have their worth for a number of other health reasons, so don't stop doing them. They just not proven to help with breast cancer risk.