What type of swimmer does not require immediate rescue?

The swimmer who is floating on their back and relaxed does not require immediate rescue because this position indicates that they are in control of their situation and can manage their own buoyancy. Floating on one's back is a skilled, passive form of resting in the water which suggests that the swimmer is comfortable and not in any distress. This position allows them to conserve energy and breathe easily while maintaining a safe posture.

In contrast, swimmers who are actively participating in a lesson, showing signs of panic, or struggling to swim indicate varying levels of distress or need for assistance. Those engaged in a lesson may still be under supervision and have the knowledge of the surroundings. A panicked swimmer is exhibiting clear signs of needing help, as panic can lead to dangerous situations. Similarly, a struggling swimmer requires immediate support to prevent drowning or injury. Hence, being relaxed and floating demonstrates competence and safety in the water, distinguishing this swimmer from those requiring urgent attention.