The document discusses concepts of health, illness, disease, and rehabilitation. It defines health using biomedical, ecological, psychosocial, and holistic concepts. Health is described as a state of complete physical, mental and social well-being. Illness is the personal experience of disease and involves assuming a sick role. Rehabilitation aims to train individuals to the highest level of functional ability using medical, social, educational and vocational measures. The document outlines levels of health care from primary to tertiary and levels of fitness from beginner to elite athlete.