Among the first things to be aimed at should be a correct position, both in sitting and in standing. God made humans upright, and He desires them to possess not only the physical but the mental and moral benefit, the grace and dignity and self-possession, the courage and self-reliance, that an erect bearing greatly tends to promote. Let the teacher give instruction on this point by example and precept. Show what a correct position is, and insist that it be maintained. TEd 119.1
Next in importance to right position are respiration and vocal culture. The one who sits and stands erect is more likely than others to breathe properly. But the teacher should impress upon students the importance of deep breathing. Show how the healthy action of the respiratory organs, assisting the circulation of the blood, invigorates the whole system, excites the appetite, promotes digestion, and induces sound, sweet sleep. This not only refreshes the body but soothes and tranquilizes the mind. Let exercises in deep breathing be given, and see that the habit becomes established. TEd 119.2
The training of the voice has an important place in physical development, since it tends to expand and strengthen the lungs, and thus to ward off disease. To ensure correct delivery in reading and speaking, see that the abdominal muscles have full play in breathing and that the respiratory organs are unrestricted. Let the strain come on the muscles of the abdomen rather than on those of the throat. Great weariness and serious disease of the throat and lungs may thus be prevented. Careful attention should be given to securing distinct articulation, smooth, well-modulated tones, and a not-too-rapid delivery. This will not only promote health but will add greatly to the agreeableness and efficiency of the student’s work. TEd 119.3
In the study of hygiene the earnest teacher will improve every opportunity to show the necessity of perfect cleanliness both in personal habits and in one’s surroundings. The value of a daily bath in promoting health and in stimulating mental action, should be emphasized. Attention should be given also to sunlight and ventilation, the hygiene of the sleeping room and the kitchen. Teach students that a healthful sleeping room, a thoroughly clean kitchen, and a tastefully arranged, wholesomely supplied table, will go further toward securing the happiness of the family than any amount of expensive furnishings. That “life is more than food, and the body is more than clothing” (Luke 12:23) is a lesson no less needed now than when first given by the divine Teacher. TEd 119.4
The student of physiology should be taught that the object of study is not merely to gain a knowledge of facts and principles. This alone will prove of little benefit. We may understand the importance of ventilation, our room may be supplied with pure air, but unless we fill our lungs properly we will suffer the results of poor respiration. The great requisite in teaching these principles is to impress students with their importance so that they will conscientiously put them into practice. TEd 120.1
Let students be impressed with the thought that the body is a temple in which God desires to dwell, that it must be kept pure, the abiding place of high and noble thoughts. As they study physiology and see that they are indeed “fearfully and wonderfully made” (Psalm 139:14), they will be inspired with reverence. Instead of marring God’s handiwork, they will have an ambition to make all that is possible of themselves, in order to fulfill the Creator’s glorious plan. Thus they will come to regard obedience to the laws of health, not as a matter of sacrifice or self-denial, but as it really is, an inestimable privilege and blessing. TEd 120.2