If you want to train more scientifically, you must master comprehensive fitness theory knowledge. In the process of learning and training, we should understand anatomy, anatomical analysis and application of human skeleton connection and skeletal muscle, and understand sports movements. Get a preliminary understanding of sports physiology, sports skills (aerobic and anaerobic working ability), factors and training methods determined by various physical qualities (strength, speed, endurance, agility and flexibility), and the principles and coping styles of sports injuries.