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Once we have developed the idea of the elbow and basic structure we use Chum Kiu and the Muk Yan Jong to develop the idea of the quickest route to the target, the synchronicity of action and the correct use of power and force. Poon Sau and Chi Sau are used to train/improve our correct behavior, thinking habits and reactions as well as our force, balance, distancing and structure. Gor sau and later sparring are used to stress us so we can find our errors and mistakes, which will be revealed under pressure.
When we find these mistakes we must then know where to go to correct them so the forms and the drills are used as tools to correct errors and not like other Martial Arts where they use techniques as a one dimensional response to any particular action.