Which of the following is NOT one of the main aspects of self-regulation in sports psychology?

Self-regulation in sports psychology focuses on the ability of athletes to manage their thoughts, emotions, and behaviors to achieve specific performance goals. The main aspects typically include goal setting, self-monitoring, and self-evaluation, all of which contribute to an athlete's ability to reflect on their performance and make necessary adjustments.

Goal setting involves establishing specific, measurable objectives that guide the athlete's training and performance efforts. Self-monitoring refers to an athlete's ability to track their own progress and behaviors, which helps them stay aware of their performance and areas needing improvement. Self-evaluation allows athletes to assess their performance critically, determining what strategies worked and what could be changed to enhance future outcomes.

Random performance testing, while it might have some merit in assessing an athlete's overall capability or fitness level, does not align with the intentional, reflective processes that characterize self-regulation. Therefore, it is not considered a main aspect of self-regulation, making it the correct answer in this context.