Looking at the video from 4:00 forward: Here is the scientific explanation of why "turning the hip," turning the hip in a small frame, small circle Tai Chi is strictly verboten and goes contrary to science.
"Moving forward and backward this motion does not affect the upper body to any movement because the two forces are orthogonal. But if the pelvis also has some turning motion, then there will be an effect on the upper body turning force. If the pelvis turns now, we have two turning springs in action one is the internal waist turning spring the other is a leg crossing turning spring which is a very weak spring. Therefore hip should not have turning movement. "
Very thought-provoking! The closed captions instead of default are quite thoughtful. I think this will be the “gold standard” for Tai Chi, particularly in Scientific thought. The analysis and subsequent redesign to accurately reflect the science I think Master Hwa learned from his teacher is quite an accomplishment. Not only that, but as shown in the content and presentation, it seems to reach all levels for the uplift of others and is quite impressive.
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