theory of planned behavior (TPB) has been applied to many areas of research in physical activity with varying degrees of success I would argue. This paper looks at the ability of TPB to predict participation in physical activity and explored the development of activity habits in a 12-week study. Gym members completed standard theory of planned behavior measures at baseline and follow-up. The author argues that the results suggest that perceived behavioral control was significantly predictive of intentions and actual behavior. That stable exercise habits developed in the first 5 weeks of the study, and that successful prior performance enhanced perceptions of behavioral control. As part of my current research I am running a 12 week circuit training class to study adherence. The findings of the study regarding the 5 week period for exercise habits to develop are particularly interesting as in my study the findings for this element are broadly similar. The article can be found here
Armitage, C. (2005). Can the Theory of Planned Behavior Predict the Maintenance of Physical Activity? Health Psychology, 24 (3), 235-245 DOI: 10.1037/0278-6220.127.116.11
Chatzisarantis, N., Hagger, M., & Smith, B. (2007). Influences of perceived autonomy support on physical activity within the theory of planned behavior. European Journal of Social Psychology, 37(5), 934.