How is lateral flexion best described?

Lateral flexion is characterized as the bending of the torso to the side, which directly corresponds to the definition provided in the correct choice. This movement typically occurs in the coronal plane and involves the muscles on one side of the body contracting in order to bend the trunk away from the midline.

In the context of anatomy and sports medicine, understanding lateral flexion is essential, especially when analyzing movements in activities like gymnastics, dance, or any sport that requires bending or leaning to either side. Recognizing this specific movement helps in assessing muscle function, balance, and range of motion, which are critical for athletic performance and injury prevention.