What is defined as the body’s contact point(s) with the ground or other stable surfaces?

The term that refers to the body's contact points with the ground or other stable surfaces is the base of support. This concept is crucial in understanding balance and stability during movement. The base of support is determined by the size and positioning of the area that is in contact with the ground, which impacts how stable a person is while standing or performing various physical activities. A wider base of support generally provides more stability, making it easier to maintain balance.

In contrast, stability refers to the ability to maintain the body's position, which is influenced by the base of support but is a broader concept that also involves factors like the center of gravity. The center of gravity itself is the point where the body’s mass is evenly distributed, which also plays a role in balance but does not specifically refer to contact points.

The cardiorespiratory system, while important for overall fitness and endurance, does not relate to the physical structure and mechanics involved in balance and stability in the way that the base of support does. This is why the base of support is the correct choice in this context.