Planned Behavior, Attitude Strength, Role Identity, and the Prediction of Exercise Behavior

The aim of this study was to examine the attitude–exercise behavior relationship according to the theory of planned behavior. Two additional variables, multicomponent attitude strength and role identity, were constructed to expand the initial model. The participation of 395 females in physical fitness programs over a 2-month period served as a behavioral criterion. Attitudes toward behavior, perceived behavioral control, role identity, and attitude strength predicted intention to exercise. Also, exercise behavior was predicted from intention, perceived behavioral control, role identity, and attitude strength. Perceived behavioral control was a more accurate predictor of behavior than of intention. Results also showed that the planned behavior model was slightly more successful in predicting exercise behavior when attitude strength and role identity were added to the analysis. Findings are discussed in terms of theoretical and practical implications and in terms of the role of intention, perceived behavioral control, role identity, and attitude strength variables for understanding attitude–behavior relationships.