Health refers to a person's physical, mental and social well-being.  A person is said to enjoy good health when he is free from physical discomfort and mental stress and enjoys good interpersonal relationships.  The definition of health has evolved significantly over the past few decades.  While earlier it was only associated with a person's physical well-being, it now refers to a state in which a person enjoys good mental health, is spiritually awakened and leads a good social life.
Health is not only about what you eat, health is about what you think and say." It is generally said that a person enjoys good health when he is mentally and physically healthy. However, health is more important than this. The modern definition of health includes many other aspects that need to be taken care of to enjoy a healthy life.
In the beginning, health was simply the ability of the body to function well.  He had to face problems only because of physical problems or illness.  In 1948, the World Health Organization (WHO) defined health as a state of complete physical, mental and social well-being of an individual and not merely the absence of disease.  This definition has been accepted by some but largely criticized.  This definition of health was said to be too broad and therefore incorrect.  It was long dismissed as impractical.  A new concept of health was introduced in 1980.  Under this health is considered as a resource and not just a state.
Today a person is considered healthy when he enjoys good physical, mental, social, spiritual and cognitive health.
Good health is the basis for performing various tasks in life.  Here's how it helps
Family Life: A physically unfit person cannot take care of his family.  Likewise, if a person experiences mental stress and is unable to manage his emotions, he cannot build and nurture good relationships with his family. Another factor that has the most detrimental effect on health is drug use.  Excessive alcohol addiction and smoking greatly increase the risk of the disease.  The chemicals present in tamarisk affect every organ in the body.
Illness can be caused by accidents, violence and rape.  Unsafe sex can lead to sexually transmitted infections such as HIV, and the health of both mother and baby can be compromised due to complications related to pregnancy and childbirth.  Infertility, availability and use of contraceptives are related to reproductive health.  Problems related to sexual health also affect the individual negatively.  Examples include erectile dysfunction in men and vaginismus in women.  Gender-related inequalities may also affect health.  Transgenders and other gender-sexual minorities may also have problems.  In today's unique living environment, mental illnesses such as depression, anxiety, pollution and lack of clean water may increase diseases.
Health is defined as a state of physical, mental and social well-being in which there are no adverse factors and the natural functions of the body are functioning properly.
It is absolutely true to say that a physically unfit person cannot function properly.  Good mental health is essential to work effectively.  One must enjoy good social and cognitive health to hold up at work