How can physical activity be changed--basic concepts and general principles in the promotion of health-related physical activity.

Basic concepts and general principles in the promotion of health-related physical activity are presented based on selected behavioral science theories, research findings and conceptual analysis. The concepts and principles selected include (1) a realistic and flexible concept of physical activity, (2) a pragmatic use of the determinants of physical activity, (3) targeting promotion to specific stages of adoption at a time, (4) a systematic facilitation of the change process by health communications and environmental changes, and (5) a stepwise organization of the promotional activities while respecting the target people's freedom of choice.