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Hello,
Thank you for all your answers, I am happy that you like the pictures!
I strive myself for gesture purity, so I agree that especially on my backside I have to reduce arm movements further. I think it is simply a matter of routine - with more exercise the corrections of position get finer and smaller until at some point they are almost invisible, as Jacques and Patrice manage it to do.
However I think the rotation is enough. As Jacques said one should only rotate as much as necessary. More rotation only leads to a stiff body position with too little flexibility, in my opinion. Additionally I would reason that too much rotation on backside inevitably leads to pressing the knees together instead of keeping a relaxed and flexible leg position.
So it is important to avoid counter rotation, especially on backside turns, but one should not "overrotate" either.
Some asked about the camera. It is indeed a high end model: the Canon Eos 1Ds. I should add that it is not mine

, unfortunately. But thus the quality of the pics is excellent. I do not know which lens etc. was used, but it was a big and long one, so much I remember

.
The pictures were taken on the glacier in Soelden, on the Rettenbachferner piste. It had snowed one meter some days before, that is why the piste is in excellent shape already in september. Also, Soelden simply is a very good resort with very nice pistes and good snow quality most of the time.
Thanks to Jacques for building such a great board! And thanks to Jacques and Patrice for having "invented" EC and introducing others to this discipline!
Greetings, see you on the slopes,
Eduard.