In the single heel kick exercise, what should the heel do?

In the single heel kick exercise, the correct action is for the heel to be brought to the buttocks. This movement is crucial as it engages the hamstring muscles effectively while maintaining a streamlined position in the water. Bringing the heel to the buttocks allows for a powerful kick that contributes to propulsion, allowing the swimmer to move efficiently through the water.

Additionally, this position helps in maintaining proper body alignment and balance, which is essential for effective swimming technique. The upward lift of the heel ensures that the leg remains engaged and allows for maximum surface area contact with the water, enhancing the effectiveness of the kick.

Other movements, such as keeping the heel near the water surface, extending it straight behind, or keeping it away from the body, do not facilitate the intended purpose of the exercise, which is to develop strength and flexibility in the legs while maintaining proper swimming posture.