cancer

In a University of Vermont study, the fittest men were 68 percent less likely to develop lung cancer and 38 percent less likely to develop colorectal cancers than the least active men—and those who developed cancer had better outcomes if they exercised regularly. Cardio and resistance training help control inflammation and hormone levels—and they keep your immune system strong to fend off wayward cells. (Turn up your muscle gains outside the gym. These 18 Ways to Build Muscle All Day will help you shed fat, sculpt muscle, and accelerate recovery.)