Figure-Regular exercise throughout life can lower breast cancer risk. Women who exercised for around 80 minutes or more per week over their lifetimes have around a 20 percent lower risk of the disease. This means that if 10 women get cancer out of a group of 100 who didn't exercise regularly, just 8 women would get cancer out of a similar group of 100 who exercised regularly throughout life. Data source: Bernstein et al, 2005. (Tips for reading this figure.)