We discipline the mind by increasing the control of our emotions and control of our will. The body is a total physical organism. It's emphasis is on it's ability and inability to perform. It is limited by its body shell. It's controlled by specific points like the head and elbows.
Balance is controlled by momentum and by position of body weight.
It is important that physical control is maintained in the execution of an art. Training of the body thru the increased strength in your abilities, the reduction of inabilities, and the increased awareness in areas of concentration. Spirit, the force beyond the physical organism. It's emphasis on the non-physical, its abilities and its inabilities. The Spirit originates from a single spot in the lower abdomen.