"In order for children and youth to have health, happiness, vivacity, and well-developed muscle and brain, they should be much in the open air, and have well-regulated employment and amusement. Children and youth who are kept at school, and confined to books, cannot have sound physical constitutions. The exercise of the brain in study, without corresponding physical exercise, has a tendency to attract the blood to the brain, and the circulation of the blood through the system becomes unbalanced. The brain has too much blood, and the extremities too little. There should be rules regulating their studies to certain hours, and then a portion of their time should be spent in physical labor. And if their habits of eating, dressing, and sleeping were in accordance with physical law, they could obtain an education without sacrificing physical and mental health. CE 9.1"
"What? know ye not that your body is the temple of the Holy Ghost which is in you, which ye have of God, and ye are not your own? For ye are bought with a price: therefore glorify God in your body, and in your spirit, which are God’s."
EGW's passage directly applies the principle of glorifying God in your body by advocating for a balanced lifestyle that includes physical activity and proper care for one's health, aligning with the idea of the body as a temple.