ntroduction and purpose: Today, psychological skills as an evolutionary part that plays a significant role in the success of athletes and is of interest to many sports experts, the purpose of the present study is the effectiveness of mental exercises on the mental strength of teenage female athletes of the Nahavand home basketball team.
Methodology: The method of this study is semi-experimental. The statistical sample included 30 female athletes of the Nahavand home basketball team with an average age of 15.53 ± 2.59, who were included in this research through voluntary and purposeful sampling. The intended intervention was 15 minutes of mental training at the end of each training session, which included 5 minutes of relaxation exercises with breathing relaxation methods. Ten minutes of mental training was done in a lying position. Data analysis was done with the statistical method of dependent t test and analysis of covariance using Spss software, version 25, considering the first type error (α ≤ 5%).
Results:  The research findings showed that following mental exercises, in the experimental group, there was a significant increase in mental strength by 34.6%, and mental confidence by 25.9%, mental stability by 38.3%, and mental control by 43.8%. percentage was observed (P=0.001).
conclusion: This study showed that mental exercises have a significant effect on increasing the mental strength of athletes. Therefore, the role of mental imagery in the mental strength of athletes should be given more attention