Final answer:
Without a specific context in the question, assuming PST refers to Psychological Skills Training, it should be carried out in a systemic, gradual, and assiduous manner to effectively enhance an athlete's performance while avoiding arduous or fraudulent practices.
Step-by-step explanation:
The question seems to be missing a key context that identifies the subject area, whether it's a particular assignment, project, or psychological term such as Psychological Skills Training (PST), without which it is not possible to provide an accurate and specific answer. However, if we take PST to mean Psychological Skills Training, which is often used in sports psychology, the blank in the question might be filled with the word "systematic". It's important that PST is carried out in a systematic manner to ensure that athletes can gradually develop their psychological skills in a structured and measurable way.
PST should follow a gradual schedule to allow individuals to build upon their skills over time without becoming overwhelmed by arduous tasks. It requires an assiduous effort from both the athlete and the educator to ensure that skills are not only acquired but also retained, providing a residual benefit to the athlete's performance. PST emphasizes the modulation of psychological states in anticipation of or in response to competitive situations, and the use of inappropriate or fraudulent practices must be avoided to maintain the integrity of the training process.