Starting with the standard anatomical posture of the human body, the fitness book briefly expounds the human exercise execution system, introduces the physiological and biochemical energy metabolism of the human body, and introduces the classification and intensity of exercise. It includes four elements of physical exercise, basic principles and functions, and eight elements of preventing hidden dangers in sports. It also introduces the body shape correction and exercise prescription of different exercise purposes, different ages, different body shapes and special people, summarizes the matters needing attention in fitness exercise and self-supervision, and introduces a lot of fitness and health care knowledge in the form of questions and answers.