In this picture I am showing a method to develop Daan Ging or single force. Daan or Dan means single whereas Sheung is double or double arm. This method is similar in ways to using a roller bar but used only on one arm at a time with the rear hand to stabilizing. It grinds more that the roller bar as it is more isolated and is great for developing strikes like biu jee and punch power. We also use it as a sensitivity exercise.
The Dragon Chasing Pearl system is great for training internal powers "floating" (fou), "sinking" (chum), "swallowing" (tun) and "spitting" (tou) along with external coordination of joints to generate ging.