It is necessary to understand the meaning of the word health, before entering upon a description of the human body. In health, means body ease. He is a healthy man whose body is free from all disease; he carries on his normal activities without fatigue. Such a man should be able with ease to walk ten to twelve miles a day, and perform ordinary physical labour without getting tired. He can digest ordinary simple food. His mind and his senses are in state of harmony and poise. This definition does not include prize fighters and such like. A man with extraordinary physical strength is not necessarily healthy. He has merely developed his musculature, possibly at the expense of something else.
It is necessary to have enough knowledge of the human body which is expected to attain the above standard of health.
God alone knows what kind of education was prevalent in ancient times. Research workers on the subject may be able to tell us something, but only something, about it. But all of us have some experience of modern education in this country. It has no relation with our everyday life. Thus, it leaves us almost utterly ignorant about our own body. Our knowledge of our own village and our fields shares a similar fate. We are taught on the other hand, much about things that have no bearing on our daily life. I do not mean to say that such knowledge is of no use. But everything has its own place. We must first know enough of our own body, our own house, our village and its surroundings, the crops that grow there and its history before going on to anything else. General knowledge broad-based on this primary knowldege, alone can enrich life.