"Ki" is a concept in Japanese martial arts that has a strong resemblance to "Qi" in Chinese martial arts. When working with "ki" in Japanese martial arts, it may often refer to intentional and mental aspects of harnessing the body, energetic aspects such as working with systems of breath or blood, or manipulating physical structures within the body. It is, however, not magic. This may manifest as very divergent applications in Japanese martial arts ranging from Aikido to Karate or otherwise, though they will share an emphasis on working with internal systems of the body when referring to "ki".