Which signal indicates a swimmer in distress?

The identification of a swimmer in distress is critical for lifeguards and can greatly influence response times in emergency situations. A swimmer waving their arms or calling for help is a clear and immediate indication that they are experiencing difficulty. This behavior typically signifies panic or struggle, drawing attention to their need for assistance.

In contrast, other options either do not represent distress or reflect normal activities. For instance, a swimmer holding a flotation device may be using it for safety and stability rather than indicating trouble. Similarly, a swimmer swimming in a straight line and a swimmer floating on their back might just be practicing or enjoying the water without any distress signals. Recognizing the specific behaviors that indicate an emergency is fundamental to ensuring the safety of swimmers and allowing lifeguards to act swiftly when necessary.