Which of the following best describes finning?

Finning refers to a swimming technique that involves a pushing motion with the arms while the swimmer is in a streamlined position to propel themselves forward in the water. This technique is essential for efficient swimming strokes, as it allows swimmers to gain speed and maintain momentum. When executed correctly, the arms push against the water effectively, creating propulsion that helps the swimmer move through the water with minimal resistance.

The other options describe movements that are not representative of finning. A fluttering motion of the feet relates more to leg kicks, which are important but not the primary focus of finning. A quick motion of the arms only implies a focus on the arms without the necessary coordination that includes a proper pushing technique. A twisting motion of the torso might be involved in some swimming strokes for rotation but does not specifically define finning, which centers around the action of the arms pushing through the water.