This document discusses physical fitness and its components. It defines physical activity and groups it into light, moderate, and vigorous intensities. Physical fitness has two main components - health-related physical fitness and skill-related physical fitness. Health-related physical fitness includes cardiovascular fitness, muscular endurance, muscular strength, flexibility, and body composition. Skill-related physical fitness includes agility, balance, coordination, speed, reaction time, and power. Several exercises are provided as examples to improve the aspects of physical fitness.