This document defines health and outlines key aspects of maintaining good physical, mental, and social health. It discusses prevention through healthy habits like exercise and nutrition, as well as regular checkups. Specific healthy habits are outlined, including good hygiene, sufficient sleep, good posture, exercise, and leisure activities. A healthy diet is described as eating a variety of foods, reducing fats and sugar, and eating plenty of fiber. Accident prevention is also covered, noting the importance of prevention at home, school, and on the street.