Which physical ability is often improved by agility training?

Agility training primarily focuses on enhancing the ability to change direction rapidly and efficiently, which directly contributes to improved speed. When athletes engage in agility drills—like ladder drills, cone sprints, and obstacle courses—they are training their muscles to respond quickly to various stimuli. This involves not only quick footwork but also coordination and reaction time, which are critical for executing rapid movements.

Speed benefits from agility training because as individuals become more adept at moving quickly in response to challenges, their overall pace in sports or physical activities tends to increase. By sharpening their agility, athletes can run faster during sports, as they will be able to accelerate and decelerate effectively while maintaining control over their movements.

In contrast, while endurance, balance, and flexibility can be components of an athlete's overall performance, the primary aspect that agility training enhances is speed, making it the most relevant choice in the context of this question.