A rapid whole-body movement with a change of direction or velocity in response to a stimulus is known as which of the following?

The definition provided aligns perfectly with the concept of agility. Agility refers to the ability to move quickly and easily, especially when changing direction or speed in response to external stimuli, such as an opponent in a sport or a sudden obstacle. This skill encompasses not just speed but also the ability to make precise movements while maintaining control and stability.

In sports and athletic scenarios, agility is crucial for performance, allowing an athlete to navigate dynamic environments effectively. This necessitates not just physical capability but also a cognitive component, as the athlete must anticipate and respond to various stimuli.

The other terms mentioned do not encompass the full context of the definition. Speed refers solely to the rate of movement without factoring in direction changes. Balance pertains to the ability to maintain control and stability, but it does not necessarily involve rapid movements. Coordination involves the harmonious functioning of various body parts during movement but doesn't focus specifically on rapid responses to stimuli or changes in direction.