This document defines and provides examples of four components of fitness: balance, coordination, power, and reaction time. It states that balance is the ability to maintain stability during stationary or moving positions. Power is the ability to exert maximum muscle force quickly and explosively, requiring both strength and speed. Reaction time is the ability to respond to a stimulus. Coordination is the ability to use all components to perform movements effectively. The document aims to help the reader understand these components and apply them to sports examples, and classify them as health-related or skill-related fitness.