A healthy body image is related to better psychological well-being and can also impact one’s likelihood to engage in health promoting behaviours such as exercise. To date, there has been a paucity of research investigating the relationship between body image and Self-Determination Theory’s motivational regulations as a function of exercise participation. The purpose of this study was to examine these constructs over the course of an 18-week cardiovascular-based program for female initiates aged 18-45 with overweight and obesity