Exercise also boosts your emotional health in other ways. For example, a person who becomes fit is likely to have a stronger self-image.

Use It or Lose It

According to a 1990 CDC study, lack of exercise and poor diet accounts for about 14 percent of all deaths every year, making this combination the biggest lifestyle-related killer of Americans aside from smoking.

Failure to exercise can be directly linked to higher risk of coronary artery disease, colon cancer and type 2 diabetes, according to the CDC. People who are regularly active sharply reduce these risks.

However, you must continue to exercise throughout your lifetime to maintain these benefits. Within months of stopping exercise, nearly all of the health benefits of exercise disappear.

Even professional athletes fail to maintain any of the long-term benefits of exercise unless they continue to remain active. Therefore, it is important to view exercise as an ongoing, long-term investment in better health.