Fitness helps prevent you from getting sick. A study of 8,301 employees found that unfit people were 2.5 times as likely to call in sick. Men who exercise are less likely to get prostate cancer. Among 20,785 Harvard alumni, only one man who burned up more than 4,000 calories a week exercising got prostate cancer. Those who burned fewer than 1,000 had 38 cases.
Exercise builds strong bones.
Among 101 men 60 and older who took up exercise, bone density increased 19 percent on average. Exercisers are depression resistant. Exercise helps you go to sleep. Duke University scientists report that men who exercise fall asleep in half the time that it takes men who don't. Fit people have better sex lives.