ACSM Personal Trainer Certification Practice Exam 2025 - Free Personal Trainer Practice Questions and Study Guide

The movement associated with the horizontal plane is abduction and adduction. The horizontal plane, also known as the transverse plane, divides the body into upper and lower parts and is involved in rotational movements.

Abduction refers to the movement of a limb away from the midline of the body, and adduction is the movement of a limb toward the midline. These actions occur around a vertical axis and typically involve movements at joints such as the shoulder and hip, making them relevant to the horizontal plane.

In contrast, pronation is a rotational movement but does not specifically involve the horizontal plane as prominently as abduction and adduction. Extension and flexion are primarily movements that occur in the sagittal plane, which divides the body into left and right parts. Thus, the association of abduction and adduction with the horizontal plane solidifies its role in describing motions that involve rotation and lateral movements of limbs.