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South says: "God made no faculty but also provided it with a proper object on which to exercise itself." As God does no unnecessary thing, exercise is essential to the health and development of each organ of the body, each faculty of the soul. Progress demands constant renewal and readjustment. Change is the changeless law of nature. The old must give place to the new. The present is but the everchanging eternal link that binds the future to the past, and in all organic life, with properly regulated activities, each new link will be stronger than the last. Evolution is the law of God. Crabbe defines exercise as "repeated or continued exertion, coupled with purpose." Physiologically, it is that wisely regulated activity through which, by one of those beautiful compensations, so often observed in nature, both the force expended and the atoms destroyed, are renewed in more potential form. It
SCHENCK WL. EXERCISE—ITS PHYSIOLOGIC FUNCTIONS.Read before the Topeka Academy of Medicine.. JAMA. 1894;XXII(12):417-421. doi:10.1001/jama.1894.02420910015001b