Chi is a life force energy that circulates in everyone. Some people are aware that they have chi energy in their body. Some are not. However, those who are not aware can realize their chi through practice of breathing (to bring in) and physical practice (to balance). Most skills or techniques require chi for the character to release. However, if a character tries to use a technique beyond their chi capacity, or current chi, the character's health will suffer badly, either by sickness or death.