<![CDATA[Psychological factors that can potentially improve athlete performance are called Psychological Skills Training (PST). PST refers to psychological skill training that is systematic and consistent in improving the athlete’s performance and achievement. Studies on the effectiveness of psychological techniques, such as self-talk, imagery, and goal setting, are often used as training tools for athletes. This study aimed to determine the content validity of the Self-talk Guide Book developed as a guide for implementing psychological exercises for athletes. This Book contained the types of self-talk, how to apply it, and ways for athletes to easily respond to any negative self-talk arising in their minds. The research used Research and Development method with the ADDIE design which focused on the "Development" stage. The target of this research was experts, including psychologists and mental coaches, to examine the content validity of the book. The analysis used was Aiken Validity and Combat Alpha. The Aiken Validity formula test gained a score of 0.700 to 1.000. The result indicates that the resulting content validity is High. The results of this study can be used as a guide to carry out the next stage of the "Self-talk Guidance" development, namely the Implementation and Evaluation stages so that the resulting book has good quality and is suitable for guiding athletes in practicing self-talk.]]>
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