Health promotion is a general philosophy that has at its core the idea that good health, or wellness, is a personal and collective achievement. For the individual, health promotion involves developing a program of good health habits early in life and carrying them through adulthood and old age. For the medical practitioner, health promotion involves teaching people how best to achieve this healthy lifestyle and helping people at risk for particular health problems learn behaviours to offset or monitor those risks. For the psychologist, health promotion involves the development of interventions to help people practise healthy behaviours and change poor ones. The mass media can contribute to health promotion by educating people about health risks posed by certain behaviours, such as smoking or excessive alcohol consumption. Legislation can contribute to health promotion by mandating certain activities that may reduce risks, such as the use of child-restraining seats and seat belts, and banning smoking within indoor public places.