Researchers offer no guarantees, but it looks like regular exercise increases the chances that prostate cancer will not spread beyond the prostate. HealthDay reports on an American Cancer Society study that included more than 10,000 men, aged 50 to 93, who were diagnosed with localized prostate cancer between 1992 and 2011. Researchers surveyed the men, asking about their physical activity before and after their diagnosis. Ready? The envelope please….the researchers found that men with the highest levels of exercise before their diagnosis were 30 percent less likely to die of their prostate cancer than those who exercised the least. In fact, more exercise appeared to provide more protection: Men with the highest levels of exercise after diagnosis were 34 percent less likely to die of prostate cancer than those who did the least exercise.