Wolfi,,,,what

, me stiff whrist, it might appear to you my hand is stiff, . It is NOT..no no no., this is a video demo and not a continous passage as I am playing a trill,because, the mometum is temp stopped. I think you are a bit judgemetal here...
My taught was from as still as possible and I did not invent this, the masters.-people from the consevatory. Are you saying they all wrong..I doubt.
My hands are strong over period of training, never had a really tiring hands,I have to be honest. Using whrist is my LAST resource, just as you have seen in my chopin studies op10-1. I can play it 10 times in a row with medium temp. Touch wood, never had damaged hands..
I rather keep my hands still. While keeping still that gives the best gravity feed into key bed that gives ME a better control.
I am not saying wobbly is bad, but the point I am making here is you CAN NOT BEAT the law of physics/consevation, the more movement /motion you make the more wasteful and harder to control. Look at Holowize, he is still. I hope this clears up some misunderstanding.
Ps just watche Bariboim, his hands is pretty still too. but it is in a continous motion, thereofre momentum is not stopped .