B

　　Physical fitness refers to good health, and is the result of regular exercise, proper diet and nutrition, and proper rest for physical recovery. A person who is physically fit will be able to walk or run without getting breathless and he or she will be able to carry out the activities of everyday living and will not need help. How much each person can do will depend on their age and whether they are a man or woman. A physically fit person usually has a normal weight for height. The relation between height and weight is called the Body_Mass_Index. A taller person can be heavier and still be fit. If a person is too heavy or too thin for the height, it may affect the health.

　　Mental health refers to a person's emotional and psychological well－being. “A state of emotional and psychological well－being in which an individual is able to use his or her thinking and emotional (feeling) abilities, function in society, and meet the ordinary demands of everyday life.”le and efficient, being able to handle normal levels of stress, having good friends and family, leading an independent life, being able to “bounce back” and recovering from hardships, are all signs of mental health.

　　Public health refers to trying to stop a disease that is unhealthy to the community, and does not help in long life or promote your health. This is fixed by organized efforts and choices of society, public and private clubs, communities and individuals.

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