The aim of this study was to examine the fluctuation of fatigue, the association of fatigue with motivation, perfectionism and competitive anxiety, and the moderating effects of perfectionism and competitive anxiety on fatigue and motivation. The study involved 22 members of the junior national team (11 male and 11 female) in sport climbing in the age range of 13 to 18 years (M = 15.64; SD = 1.68). The Sports Competitive Anxiety Test (SCAT), the Multidimensional Inventory of Perfectionism in Sports (MIPS), the Situational Motivation Scale in a Sports Context (SIMS) and the Borg Fatigue Scale (RPE) were used. The study lasted seven months, and a total of 770 measurements were taken. A small part of the research was conducted live using the paper-pencil method, while the majority was conducted in an online format using Google forms. The results showed that most respondents experienced the least fatigue at the beginning of the season, while the highest levels of fatigue varied from respondent to respondent. There was no statistically significant correlation fatigue and perfectionism or competitive anxiety. A statistically significant correlation between fatigue and motivation was found in a few subjects, both in positive and negative directions, depending on the subject. Furthermore, a negative moderating effect of perfectionism and competitive anxiety on fatigue and motivation was obtained. Although the obtained results are not in accordance with the set hypotheses, this research emphasizes the importance of a personalized approach in sports and the need for a balance between the mental and physical load that sports at a high level brings, all in order to preserve the mental health of athletes while achieving the desired results.