Next in line is the Tai Chi posture of the wu chi, tai chi, santi progression.
Here are a few simple connections of the tai chi posture to get you started:
Finger tips forward, ming men backward
Wrists up while sitting the sacrum down
Have the intention of the low back (kidneys) expanding side to side
Of course the chin is tucked causing GV 20 to be lifted, the ren channel is relaxed as the du channel is pulled tight by the above stated connections.