The point is an" economical and efficient" play.
If we could reduce the unnecessary tension, we could move more fluently and quicker- the same principle for athlete.
Caution!! :

Please be careful using the fingerings which I showed in the score! Fingerings alone will not help you. Watch the exact deployment in the demonstration in the video, it is utmost essential.
I hope you can get some inspirations for your piano playing from this video.

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