Abstract
Self-determination theory (SDT) is used as a framework to understand how women's psychological well-being is influenced by participation in leisure-time physical activity and the social context in which activity occurs. Data were collected during in-depth semi-structured interviews with 20 participants and analyzed using constant comparison. Findings indicate women's well-being can be enhanced through casual participation in leisure-time physical activity if activity contexts support interaction between the elements of self-determination: competence, autonomy, and relatedness. Participant interactions during activities also play an important role in facilitating well-being outcomes. The findings qualitatively add to understanding and development of SDT as a legitimate psychological construct by explaining the key components of the theory through the participants own words and reflections.