Related to the principles of Elongated Wrist, Small Chi Sphere and Opening-Closing is that of Strength Source.

In Yang-22 there are two Strength Source which I shall term as Strength Source (Back) and Strength Source (Palm).

Beginners learn to use the Strength Source (Back) until such time when their proficiency in the control of the Small Chi Sphere enables them to use the Strength Source (Palm) instead.

For combative applications the Strength Source (Palm) is used because it resides in the hand and thus can be used to impart a force into the opponent’s body in the fastest time, given the shorter distance from hand to target.

By comparison, the use of Strength Source (Back) would take a longer time to move the power from the back to target. This is why the Strength Source (Back) is for training the power rather than for combative applications.

In the study of Strength Source you must first achieve the Elongated Wrist without which your power cannot pass through the Wrist Pearl to the hand.

You then need to practice the control of the Small Chi Sphere a lot, in particular the action of inserting the Small Chi Sphere into the Shoulder Chi Ring. Later you should learn to dissipate the Small Chi Sphere across space to an imaginary dot in space.

To train the Strength Source (Back) pay attention to the practice of the principle of Opening-Closing. The opening and closing of your back is like a bellows expanding and contracting to pump air.