Final answer:
The correct statement indicating that the client understands how to begin an exercise program is that they will gradually increase the duration and intensity of their exercises, reflecting knowledge of the importance of a measured approach to increasing physical activity.
Step-by-step explanation:
When a community health nurse is assessing a client's understanding of the steps to begin an exercise program, it is important that the client shows an appreciation for a safe and gradual increase in physical activity. The correct statement indicating the client's understanding would be "I'll gradually increase the duration and intensity of my exercises." This approach avoids the all-or-nothing point of view and supports building up to a more active lifestyle at a sustainable pace. Engaging in at least 30 minutes of moderate activity most days of the week is essential for health and helps in maintaining a healthy weight by using energy that balances caloric intake.