Abstract Objectives The purpose of this study was to: 1) determine the relationship between type of motivation and adherence to dietary goals among personal training clients, and 2) to explore the relationship between regular implementation planning and adherence to dietary goals. Furthermore, this study seeks to investigate personal training clients’ experiences with dietary change attempts and nutritional advice from PFTs. It is hypothesized that autonomous motivation will be positively correlated with dietary goal adherence, and that autonomous motivation combined with implementation planning will be highly correlated with dietary goal adherence. Methods This 6-week mixed methods study sought out female personal training clients at a public comprehensive university who were interested in improving their dietary habits (n = 19). All participants were presented with information about the DGA and asked to set a daily dietary goal to bring their diet in tighter alignment with those guidelines. They were asked to rate their source of motivation for the goal as either autonomous or controlled. Participants were randomly assigned to one of two groups: Control group (C), or (2) Implementation Planning group (IP) both of which tracked goal adherence and reasons for non-adherence on a daily basis. In addition, IP participated in weekly implementation planning sessions. Results Results suggested that participants adhered to their self-selected daily dietary goals approximately 62% of the time, irrespective of group assignment. No significant correlation was found between the source of motivation, implementation planning, and adherence, although the small sample size makes it difficult to determine whether the lack of correlation was valid or due to low statistical power. Conclusions There were no statistically significant correlations found among the motivation, implementation planning, and adherence variables. Furthermore, participants revealed that few PFTs are giving sound, or any, nutritional guidance. Funding Sources No funding sources to report.