BP(vii) – BP(viii) completes the trilogy of fundamental arm movements by covering the principle of sinking in the use of the arms through the use of intention.
If BP(iv) – BP(v) is about the 3-Count performed in one direction, then BP(vii) – BP(viii) covers the reverse direction.
To check if you are doing it correctly refer to page 262 for the relevant structure test. Acquiring this skill is useful in helping you to sink and control your training partner’s bridge in push hands game.
From BP(i) – BP(viii) the basic body structure and principles of TaijiKinesis are covered.