There is some evidence to suggest that men in occupations requiring a good deal of physical activity may have a lower death rate from coronary heart disease than those in sedentary occupations. Regular vigorous exercise may actually prevent heart disease by increasing the blood supply to the heart muscle and decreasing the amount of cholesterol deposited to plug the coronary arteries. And, as we have stated, exercise helps to combat overweigth which is often associated with coronary disease. 

Farmers and labourers have a lower death rate from coronary disease than business executives, and postmen lower than clerks. In addition, the sedentary occupations usually require a greater degree of mental activity, anxiety and stress, which may contribute further to this problem. 

To place in its proper perspective it must be realized that heredity, nutrition and unknown factors all have a part to play in heart disease. 

The healthy heart, which is a specialized and important muscle, responds to activity just as other muscles in the body. The proper amount and type of exercise is beneficial and actually improves its function. It becomes more efficient and the circulation improves. It is better able to withstand physical and possibly mental stress.