For thousands of years, physical activity has been associated with health. Today, science has confirmed the link, with overwhelming evidence that people who lead active lifestyles are less likely to die early, or to experience major illnesses such as heart disease, diabetes and colon cancer.

　　Exercise benefits every part of the body, including the mind. Exercising causes the body to produce endorphins, chemicals that lead a person to feel peaceful and happy. Exercise can help some people sleep better. It can also help with mental health issues such as mild depression and self-esteem. Plus, exercise can give people a real sense of accomplishment and pride at having achieved a certain goal - like beating an old time in the 100-meter dash.