Which movement decreases the angle of a joint?

Flexion is defined as a movement that decreases the angle between two body parts, typically at a joint. For instance, when you bend your elbow or knee, you are performing flexion, which brings the body parts closer together at the joint and thus reduces the angle formed between them. This movement contrasts with extension, which increases the angle at the joint, and is often exemplified by straightening the arm or leg. Abduction involves moving a limb away from the midline of the body, while adduction involves moving it toward the midline. Both abduction and adduction do not focus on the bending action that is characteristic of flexion. Therefore, flexion is exclusively the movement that decreases the angle of a joint.