A swimming cap is primarily used to keep hair out of the face and reduce drag in the water, allowing the swimmer to move more efficiently.

Polarized goggles are not typically used for swimming as they are designed to reduce glare from sunlight, which is not a significant issue underwater.

A kickboard is primarily used to help swimmers develop proper kicking technique and improve their leg strength and coordination.

Webbed fins are not typically used for swimming as they are designed for snorkeling and diving, where they provide additional propulsion and maneuverability.

A snorkel is primarily used to allow swimmers to breathe while their face is in the water, enabling them to swim continuously without having to lift their head to take a breath.

Swim fins are not typically considered a training aid as they are primarily used for recreational swimming and snorkeling.

A pull buoy is primarily used to help swimmers develop proper arm stroke technique by isolating the upper body and allowing them to focus on their arm movements.

Bikinis are not typically used as racing suits in competitive swimming due to their lack of coverage and potential to cause drag.

A starting block is primarily used to provide a stable and elevated platform for swimmers to start their race, ensuring a fair and consistent start for all competitors.

Backstroke flags are not lane lines but are used to indicate the end of the pool for backstroke swimmers.

Lane line buoys are primarily used to mark the boundaries of each swimming lane, ensuring that swimmers stay within their designated lane during a race.

Manual timing systems are no longer commonly used in competitive swimming due to their potential for human error and inconsistency.

Touchpads are primarily used to record the time of each swimmer as they touch the wall at the end of their race, providing accurate and consistent timing results.

Butterfly is not a swimming stroke but rather a type of swimming technique used in the butterfly stroke.

A swimming coach is primarily responsible for training and guiding swimmers to improve their performance, including developing training plans, providing technical instruction, and motivating athletes.