[Testimonies for the Church 3:489-492 (1875).]
Ministers, teachers, and students do not become as intelligent as they should in regard to the necessity of physical exercise in the open air. They neglect this duty, which is most essential for the preservation of health. They closely apply their minds to books, and eat the allowance of a laboring man. Under such habits, some grow corpulent, because the system is clogged. Others become lean, feeble, and weak, because their vital powers are exhausted in throwing off the excess of food; the liver becomes burdened and unable to throw off the impurities in the blood, and sickness is the result. If physical exercise were combined with mental exertion, the blood would be quickened in its circulation, the action of the heart would be more perfect, impure matter would be thrown off, and new life and vigor would be experienced in every part of the body. CH 572.1