What indicates that a swimmer is too fatigued to continue swimming?

A swimmer is considered too fatigued to continue swimming when they demonstrate difficulty remaining afloat or treading water. This behavior signals that the swimmer is struggling to keep their head above water, which can lead to panic and further exhaustion. Keeping oneself afloat requires energy and strength; when a swimmer is unable to do this, it indicates that they have likely reached their physical limits and may be at risk of drowning. Recognizing this sign is crucial for lifeguards and others to intervene promptly and provide assistance.

Increased speed in swimming would typically suggest that a swimmer is still functioning well and has enough energy. Complaints of thirst and hunger, while they can indicate fatigue, do not necessarily imply an immediate risk of drowning. Waving at a lifeguard for fun would generally reflect a swimmer's comfort in the water, rather than an indication of fatigue. Therefore, effective monitoring for signs of distress and fatigue, particularly the inability to stay afloat, is essential in a lifeguard's role.