Which of the following is NOT a sign that someone is in trouble in the water?

Waving arms enthusiastically is typically interpreted as a sign of excitement or joy, such as when someone is trying to get attention or signal to friends, rather than indicating they're in trouble. In contrast, signs that someone may be struggling or in distress in the water often include more frantic movements, such as splashing or flailing arms.

The other options reflect behaviors that are clearly indicative of a person having difficulties. Climbing a ladder may suggest they are trying to exit the water but could also indicate they are in distress if they are struggling to do so. Facedown in the water is a critical warning sign, as it suggests the person may be unconscious or unable to keep their head above water. Hair in the face can impair visibility, and while it may not directly signal trouble, it can hinder a person’s ability to stay afloat or attract attention. Understanding these different behaviors is essential for lifeguards in assessing and responding to potential emergencies in the water.