This document discusses the key components of physical fitness and methods of training. It outlines the five health-related components of fitness - cardiovascular endurance, muscular strength, muscular endurance, body composition, and flexibility. It also describes the six skill-related components - agility, balance, coordination, power, reaction time, and speed. Various training methods are explained, including circuit training, continuous training, interval training, and weight training. The principles of training - specificity, overload, progression, and reversibility - and the FITT principles of frequency, intensity, time, and type are also defined for developing an effective exercise program.