Hand-Foot opens but does not close
- The hand and foot must have a connection through the waist, or dantiian area. In this case the waist becomes the modifier.
- The hand and foot must stay on a curved or straight line, causing this connection.
- Opening means to move outwards, causing the distance between the hand and foot to lengthen.
- The hand and foot can never move towards each other (please note that the meaning of this requires further clarification later on).
http://practicalmethod.com/2011/03/importance-of-waist-for-hand-foot-connection/
Source: https://practicalmethod.com/?p=14012