Health, as defined in the World Health Organization (WHO) constitution:

Health is a state of complete physical, mental and social well-being and not merely the absence of disease or infirmity.^[1]

The definition was updated in the 1986 WHO "Ottawa Charter for Health Promotion" to say health is a "resource for everyday life, not the objective of living", and "health is a positive concept emphasizing social and personal resources, as well as physical capacities."^[2].

Physical fitness is good bodily health, and is the result of regular exercise, proper diet and nutrition, and proper rest for physical recovery.

Mental health is a concept that refers to a human individual's emotional and psychological well-being.Merriam-Webster defines mental health as "A state of emotional and psychological well-being in which an individual is able to use his or her cognitive and emotional capabilities, function in society, and meet the ordinary demands of everyday life."