What is the power ki? Can you mention martial arts that focus on this concept and how they use it?
Martial arts need to answer diffirent system.
Ki or Chi (depending on the cultural background of the use of the word) is the kinetic energy or force that is said to be within us all, as the tiger said spider is not a mystical force (as the Force of the film Star Wars franchise). but is helped by breathing and focus their confidence and positive ideas and is the spiritual aspect of martial arts disciplines are based. Martial Arts are 80% spiritual (not to be confused with religion, I too am a Christian, my faith and firm belief in God that Martial Arts has reinforced these beliefs) and 20% is often related to physical pressure points or "lines chi" or life points in the body and is also used in medicine, through the manipulation of these lines with a single blow, but strong can injure or even kill an opponent, or in the field of medicine to help cure or recovery from injury. chi but it is often their ability to focus their energy or kinetic energy of an attack by an adversary to cause injury or a moment of distraction. In Tang Soo Do (a Korean martial art like TKD) we call Neh Gung or focus and is one of our eight key concepts is the Shin Tong Il (Concentration) martial arts have the added ability to throw an opponent (Judo, Aikido, Hapkido), ki appearance is to use the opponent's energy against them to protect themselves.
Introduction DVD 1 - Filipino Martial Arts Concepts