Elbow and Waist can only close, cannot open
- The elbow and waist (from one side of the waist to the other side) must have a connection through the waist (side wall of the waist and shoulder on the same side). In this case the functional modifier is the kua.
- The elbow and waist must stay on a curved or straight line, causing this connection.
- Closing means to move inward, causing the distance between the elbow and waist to shorten.
- The elbow and waist can never move away from each other (please note that the meaning of this requires further clarification later on).