Final answer:
The specific motion referred to by Gary Gray that facilitates the gluteus medius and levels the pelvis is not provided in the context, but the gluteus medius helps stabilize the pelvis during gait and when the opposite leg is raised.
Step-by-step explanation:
The motion that Gary Gray stated would automatically facilitate the gluteus medius and level the pelvis in the frontal plane is not specified within the supplied context. However, generally, the gluteus medius plays a crucial role in stabilizing the pelvis when the opposite leg is raised during gait. This muscle is activated to prevent the dropping of the pelvis on the opposite side, thus maintaining level in the frontal plane. In other words, exercises or movements that mimic this action, such as standing hip abduction, can engage and strengthen the gluteus medius, contributing to a stable and level pelvis. Understanding the function of the gluteus medius is important because it supports the body's stabilization, posture, and movement. When carrying out functional activities or exercises, a strong gluteus medius ensures the pelvis remains stable and can prevent certain types of injuries or compensations.