If we had as much evidence about the effectiveness of modern medicine as we do about the value of exercise, we might be able to regard the medical care industry with respect. Unfortunately, that is not the case.

A study that tracked tens of thousands of midlife and older men for more than 20 years has found that vigorous exercise and other healthy lifestyle habits may cut their chances of developing a lethal type of prostate cancer by up to 68 percent.

Source: Working up a sweat may protect men from lethal prostate cancer — ScienceDaily