Which of the following is a key indicator of the action stage in behavior change?

The action stage in behavior change is marked by the active implementation of new behaviors and strategies aimed at achieving specific health-related goals. This is the phase where individuals take deliberate steps to change their behavior and demonstrate commitment to the new patterns they are establishing.

When someone is in the action stage, they are not merely planning or preparing for changes, but are actually executing the changes in their daily life. For instance, if someone decides to improve their health through exercise, they would be in the action stage when they start working out regularly, as opposed to just planning to start working out or contemplating it.

The other options relate to different stages of the behavior change process, such as planning and reflecting, which are crucial for preparation and decision-making but do not constitute the active phase of making a change. Relapse into previous habits signifies a setback typically occurring after the action stage, but does not define the action stage itself.