'Public health' is a term that covers health protection and preventive measures. The goal of public-health activities is to maintain and improve people's health. It is based on co-operation between different areas of expertise and includes, among other things, social, environmental and economic aspects.
Good health results from a physical and mental equilibrium, and each individual is responsible for their own health and wellbeing.
There are numerous methods for improving physical as well as mental health, and it is a good idea to familiarise oneself with them for preventive reasons.