If you need a reason, one with far-reaching effects, to pull yourself off the couch and exercise, I have one for you: cancer prevention. A large Japanese study found that exercising and staying physically active throughout the day can decrease your risk for cancer by 10 to 15 percent over the course for 10 years. Who knows what the next decade could bring? Being physically active is more than just running or taking a kickboxing class. While exercising regularly is great and part of cancer prevention, being physically active throughout your day, from gardening to walking, helps as well. Researchers believe that physical activity and exercise affect hormones involved in tumor production. Regular exercise combined with an active life can fight cancer — the prescription is in your hands.