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In the first part of this video Master Chu demonstrates the power that can be demonstrated buy turning the body from its center. This is the fundamental skills that is to be gained through the correct practice of Chum Kiu, before one can mobilize mass into the limbs in every movement.
In the 2nd part of the video he discusses how he utilizes the Center of Mass in order to NOT absorb the force down to the ground. He would demonstrate this by standing on scales and taking on a lot of force and we would observe that not only was there no increase of weight on the scales but there would even be a decrease (without him leaning forward).
Can you guys see what is happening in the demonstrations?