I noticed my student has changed the way she raised her arms. So I asked about it and she said that she copied what I did in a video.
It is good but not smart. Good in the sense that she took the initiative to further develop the raising of the arms. Not smart in that she copied what I did without knowing how I really did the movement in the video. As such, rather than improve the quality of her movement the copying only caused her arms to become more stiff.
In learning you should first endeavor to learn what you have been taught properly. Then you refine what you have learned properly. After you managed to refine the movement then you can try out other ways of doing the movement.
To Master Tai Chi Today you should not blindly copy what is seen. Instead, strive to understand the underlying principles which leads to my next post here.
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