The New York Times Well blog reports that people with more muscle have higher cancer survival rates. A study published in the medical journal Lancet Oncology looked at obese patients undergoing treatment for for cancer and found that those with the lowest amounts of lean muscle mass lived an average of 10 fewer months than those with greater amounts of muscle. And while I'll choose to believe that weightlifting and other muscle-building activities are the secret to beating cancer, it's good to remember that correlation does not equal causation--in other words, the difference in the cancer survival rates of some like Arnold and someone like Jack Black may have to do with factors beyond their bodybuilding abilities.
But don't head back to the couch just yet. The Well blog also reminds us that exercisers have lower rates of cancers than other people.