Regular vigorous exercise also increases the efficiency and capacity of the heart and lungs. Fit people also have greater resistance to disease and tend to recover faster if they do become ill. In addition, exercise helps people to maintain proper weight. Physically fit people are also able to resist the effects of aging better than the unfit. With regard to the psychological effects of exercise, there is some evidence that people who get regular exercise may be happier, more alert, and more relaxed than those who lead sedentary lives.
Exercise can improve a person's ability to cope with both physical and mental stress.