Which component of an OPT workout is intended to help preserve client autonomy?

Preserving client autonomy is crucial in personal training as it empowers clients to take ownership of their fitness journey. The component that specifically facilitates this autonomy is allowing the client's choice. When clients have the opportunity to make decisions about their workouts, including which exercises to perform, how intensely to engage, and the structure of their training sessions, it fosters a sense of control and personal investment in their fitness goals.

By incorporating the client's preferences into the workout design, trainers not only increase engagement and motivation but also enhance adherence to the exercise program. This kind of collaboration can lead to better results, as clients are more likely to stick with a program they feel is tailored to their interests and lifestyle.

The other options, such as trainer's recommendations, standardized exercises, and mandatory progressions, focus more on directing the client without considering their preferences. While these elements can be important and beneficial for structure and safety, they do not inherently support the concept of autonomy in the same way that allowing clients to make choices does.