Abstract
An increasing number of studies show that inactivity is of considerable importance in the development of heart disease. Regular exercise of sufficient intensity may actually retard the development of degenerative fibrotic lesions of the heart muscle and maintain the elasticity of blood vessels. The author reports on three studies made in different parts of the world which present convincing evidence that the entire mode of life, not nutrition alone, may be important in retarding or accelerating the incidence of heart disease.

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