Vital Qi, True Qi, and Middle Qi were common concepts in martial arts novels. They usually referred to some kind of energy or power within the human body. The concept of qi may have different explanations and meanings in different novels, but generally speaking, it is considered a mysterious energy that can be obtained or improved through cultivation or special drugs. However, in real life, there was no conclusive evidence that the human body really had such energy or strength. Although our bodies contain some important chemicals such as oxygen, protein, and vitamins, these chemicals cannot form a type of energy or strength alone. Therefore, in novels, vitality, true qi, and qi were just fictional concepts used to describe the magical effects of powerful martial arts characters or cultivation manuals. Although these concepts are widely used in literature, they do not belong to the real world.