The benefits of physical activity for individuals are well known. However, despite this, there are various reasons why some people are not physically active, such as a lack of time, motivation, or access to appropriate resources. In this context, an established training routine and support during training can play a role in shaping self-efficacy and a positive body image, which in turn may serve as the foundation for regular physical activity. The aim of this study was to examine the role of training with a personal trainer and an established training routine in explaining self-efficacy in physical activity and satisfaction with one's body image. A convenience sample included 244 participants, of which 101 were men and 142 were women (M = 31,72 (SD = 8,96)), including those who train with a personal trainer (N = 94) and those who train independently (N = 150). Data were collected via an online LimeSurvey questionnaire. The results showed that participants with a training routine reported higher levels of self-efficacy and a more positive self-image compared to those without a routine. Furthermore, participants who trained with a personal trainer showed a better perception of their physical appearance compared to those who trained without a personal trainer. However, the results indicated no difference in self-efficacy between participants who trained with a personal trainer and those who trained without one. These findings highlight the potential importance of a structured training routine in enhancing self-efficacy and improving the perception of physical appearance. Future research should explore specific mechanisms and other potential factors that could enhance selfefficacy and body image in different populations.