Cleaning the house is good for you

Scientists have long known that exercise can reduce the risk of breast cancer, but a new study, funded by Cancer Research UK, has revealed that even doing mundane household chores can really help. The study of over 200,000 women across Europe found that the risk of breast cancer was cut by 30 percent among pre-menopausal women and 20 percent among post-menopausal women for doing such housework as washing, cooking and cleaning. Cancer Research UK's Dr. Lesley Walker said:

This study suggests that being physically active may also help reduce the risk and that something as simple and cheap as doing the housework can help.

I don't, however, recommend asking your wife to do more than her fair share of chores on the grounds that it's good for her health.