What is the main characteristic of movement termed "retraction"?

The main characteristic of movement termed "retraction" refers to the backward movement of a body part towards the posterior aspect of the body, often associated with the scapulae (shoulder blades) as they move closer together along the back. In a retraction movement, there is typically a return to a more neutral position from an anteriorly positioned state, effectively realigning the structure to a standard anatomical orientation.

The correct answer reflects this concept, as retraction can be understood as a return or adjustment towards a central or anatomical position. With movements like the shoulder blades during exercises such as rows or during various upper body postures, retraction serves to stabilize and align the shoulders, which is essential for proper biomechanics and posture.

In contrast, the other choices describe different types of movements that do not encompass the essence of retraction. Moving towards the anterior surface refers to protraction, which is the opposite of retraction. Extending the limbs outward and bending at a joint represent other fundamental movements, but they do not relate specifically to the concept of bringing parts back together or aligning them in a posterior manner as retraction does.