This study examined the relationship between internal marketing and job performance as the mediating variable of psychological ownership by focusing on fitness center trainers. The convenience sampling technique was used in the study. Data were collected from fitness centers engaged in business in Turkey. The research group consists of 177 fitness center trainers. The model test with Partial Least Squares (PLS) was used as the analysis technique in the study. The results support the model proposal that fitness center trainers' internal marketing experiences play a role in job performance both directly and indirectly through psychological ownership. Therefore, fitness centers should give importance to internal marketing to improve the experiences of their employees and obtain corporate ownership. This will increase employees’ job performance, and, consequently, customer satisfaction will be positively affected.
Keywords: internal marketing; psychological ownership; job performance; fitness center trainers; PLS-SEM