This thesis was done as a secondary research with the aim of identifying the desired competencies and characteristics of a fitness trainer by the exercisers. Findings from the research indicate a problem in terms of formal education of fitness trainers, because nowadays, in addition to university degrees, fitness trainer accreditation can be obtained through various short-term educations and even online courses. This fact points to the existence of differences in knowledge among fitness trainers. However, numerous studies have shown that formal education and level of knowledge is not a decisive factor in the satisfaction and perception of the quality of work of fitness trainers. A whole series of other characteristics have been established that form a complete picture of coaching work. This usually includes his social and communication skills. The friendlier, more communicative and more interested the fitness trainer is in the exercisers, the more successful they will consider him, the more attached to the exercise and the more satisfied he will be with his work. The lack of the mentioned elements was observed among fitness trainers who conduct group trainings, since it was their trainees who expressed dissatisfaction with the level of attention and interest shown to them during the exercise sessions.