Which of the following is a sign of a distressed swimmer?

A distressed swimmer typically exhibits signs that indicate they are having difficulty staying afloat or may be in trouble. One of the most recognizable signs of a distressed swimmer is the struggle to keep their head above water. This behavior often includes frantic movements and an inability to maintain a stable position in the water, which clearly indicates they are not swimming efficiently and require assistance.

The other scenarios do not align with the behaviors typically associated with someone in distress. For instance, swimming swiftly and confidently suggests that the swimmer is capable and not in need of help. Floating on their back with no movement could indicate relaxation rather than distress, especially if the swimmer is conscious and aware of their surroundings. Waving at friends from a distance generally implies that the individual is safe and enjoying the water, rather than being in a critical situation. Recognizing the distinction of these signs is vital for lifeguards to respond appropriately in emergency situations.