National Academy of Sports Medicine (NASM) Group Fitness Instructor Practice Exam 2025 – All-in-One Guide to Achieve Certification Success!

In the Transtheoretical Model, the Action stage is characterized by individuals who have made specific changes in their behavior and are actively engaged in those behaviors for a certain period of time. Attending a fitness class for three consecutive weeks indicates that the participant is not only aware of their health and fitness needs but is also actively participating in a behavior change effort related to exercise.

This stage typically involves the individual making a concerted effort to adopt new habits and showing commitment to those behaviors. The three weeks of consistent attendance demonstrate that the participant has moved beyond just thinking about exercise (which would be the Contemplation stage) and is now actively involved in the fitness class, making it clear that they are in the Action stage.

The Maintenance stage, on the other hand, refers to sustaining the behavior change for an extended period, typically six months or more, which would not apply in this scenario since the participant has only been attending for three weeks.