Health action process approach
The health action process approach (HAPA) is a psychological theory of health behavior change, developed by Ralf Schwarzer, Professor of Psychology at the Freie University Berlin of Berlin, Germany and SWPS University of Social Sciences and Humanities, Wroclaw, Poland, first published in 1992. Health behavior change refers to a replacement of health-compromising behaviors (such as sedentary behavior) by health-enhancing behaviors (such as physical exercise).
Source: Wikipedia — Health action process approach (CC BY-SA 4.0)