Which of the following best describes agility?

Agility is fundamentally defined as the ability to change direction quickly and efficiently while maintaining control over the body. This skill is crucial in various sports and physical activities, where rapid and precise movements are often required to evade opponents or navigate obstacles. Agility involves not just speed but also coordination, balance, and reaction time, allowing an individual to respond effectively to dynamic conditions.

While other options relate to important physical skills, they do not encapsulate the essence of agility. The ability to use strength under weight focuses more on muscular power rather than the nuanced, quick changes of direction associated with agility. Maintaining body weight pertains to metabolic and nutritional aspects that are unrelated to the physical agility required in movement. Lastly, coordinating two or more tasks refers more to cognitive and motor skills than to the specific physical skill of changing direction efficiently. Thus, the correct answer highlights the core principle of agility as a distinct athletic ability.