What should be considered a critical sign of distress in a swimmer?

A critical sign of distress in a swimmer is when they are bobbing under the water. This behavior indicates that the swimmer is struggling to stay afloat and is unable to maintain their position at the surface, which can be a life-threatening situation. Bobbling suggests that the swimmer may be experiencing fatigue, panic, or a medical emergency, making it essential for lifeguards and bystanders to recognize this sign and act quickly.

In contrast, calm swimming indicates that the swimmer is in control and is not in distress. Similarly, floating on their back can often be a sign of someone resting, rather than struggling. Swimming towards the shore typically reflects intent and capability, suggesting the swimmer is not in immediate danger. Recognizing the nuances in a swimmer's behavior is crucial for ensuring safety at the beach or pool, and identifying signs of distress like bobbling can be the key to making timely and effective rescues.