BY MICHAEL ROIZEN, M.D., AND MEHMET OZ, M.D.

You know you should break off or at least take a break from your cozy relationship with your chair and couch, and get moving. But if you need an extra push (or shove) here's something that ought to do it: possible protection from cancer.

A large study of Japanese men and women found that the more active you are on a daily basis, the lower your odds are of dying from cancer. That was true regardless of what people did whether it was butt-kicking runs on the treadmill or quiver-inducing strength workouts or leisurely rounds of golf and long walks with the dog. Yes, you heard right; people didn't have to work up a huge sweat to see a reduction in risk (though we recommend that you do work up a sweat for 20 minutes at least three times a week for plenty of other health reasons, including heart health).

Physical activity turns on a gene that binds cancer growth factors as well as fights stress and squelches inflammation. Don't waste time wondering what kind of physical activity to do. Pick the one you like and can fit into your life easily. If in doubt, walk. It's the workout you're practically guaranteed to stick to. And it's no wonder: All you need are you and your shoes. No special training, no need for a gym, no spandex required. Go now and enjoy getting younger!

The YOU Docs Mike Roizen and Mehmet Oz are authors of "YOU: Being Beautiful The Owner's Manual to Inner and Outer Beauty." To submit questions and find ways to grow younger and healthier, go to www.RealAge.com, the docs' online home.