Which levels primarily focus on the use of pull buoys?

The use of pull buoys is primarily emphasized in the advanced levels of swim instruction, particularly in levels 5 and 6. At these stages, swimmers have typically built a solid foundation of basic skills and are ready to focus on refining their stroke techniques and improving their endurance. Pull buoys serve as an excellent training tool to isolate the upper body, allowing swimmers to concentrate on their arm movements and stroke efficiency without worrying about kicking. This helps in developing strength and proper arm mechanics.

In contrast, the earlier levels such as levels 1 through 4 focus more on foundational skills, such as water comfort, floating, basic stroke introductions, and integrating kicking skills. The use of pull buoys may not be appropriate or beneficial at these levels because swimmers are still learning to coordinate their body movements and build confidence in the water. Therefore, the emphasis on utilizing pull buoys aligns appropriately with the goals of levels 5 and 6, making them the correct choice for this question.