Which of the following actions by a First Responder is NOT appropriate?

The action of yelling at bystanders who have approached a patient is not appropriate for a First Responder. Effective communication is a crucial skill in emergency situations, and maintaining a calm and composed demeanor is essential for controlling the scene and providing appropriate care. Yelling at bystanders can escalate tensions, create confusion, and distract from the urgent task of assessing and assisting the patient. A First Responder should aim to direct bystanders politely and clearly, guiding them to a safe distance without causing additional distress or disruption.

In contrast, the other actions demonstrate positive behaviors that contribute to a First Responder's readiness and effectiveness: maintaining physical fitness through regular exercise, providing emotional support to victims, and ensuring a professional appearance by keeping their gear clean all contribute to their ability to perform well in emergencies.