What aspect of fitness can be directly improved by plyometric training?

Plyometric training focuses on explosive movements that engage fast-twitch muscle fibers, which are essential for producing power and speed. This type of training involves exercises like jump squats, box jumps, and bounding, which enhance the athlete's ability to exert force quickly. This improvement in power and speed is a direct result of the high-intensity, dynamic nature of plyometric exercises. As individuals engage in these movements, they not only develop strength but also improve their athletic performance in activities requiring rapid and explosive actions, such as sprinting and jumping. Thus, plyometric training is highly effective for enhancing speed.