Stability in physical education refers to:

Stability in physical education is fundamentally about how well a body can maintain its equilibrium when faced with disturbances, whether in movement or at rest. This concept is crucial for athletes and individuals engaged in physical activities, as it determines how effectively they can perform movements without losing balance.

When a body is stable, it can resist disruption from external forces, changes in direction, or alterations in body position, thus allowing for controlled and efficient movement. This is especially important in various sports and physical activities, where maintaining balance is essential for performance, safety, and injury prevention.

The other options, while related to physical performance, do not accurately define stability. The amount of force applied to an object pertains more to dynamics and motion rather than resistance to equilibrium. Similarly, the capacity to move quickly relates to speed and agility, while performing exercises accurately focuses on technique rather than the foundational ability to maintain balance and control during movement. Therefore, the correct answer emphasizes the critical aspect of equilibrium in the context of physical education.