On this racer, you can well notice the almost parallel guidance of the legs even in the curve. So old techniques like knee by knee are forgotten in the case of modern carving and grass skiing. With this also comes a change in the load on the legs, which are no longer loaded 100% of the force on the lower legs as in the introductory lessons, but rather 60% in the lower ski and 40% in the upper ski. Thanks to the partial load of the upper ski, you will be more stable on unevenness - the skis will not curl so much and you will ride better.
The more confidence and stability you gain, the more you can try to achieve greater hips ranges and steeper turns, similar to the skier on the pictures above. At the same time, all the previous things apply about the position in the middle of the skis, the appropriate holding of the hands and, above all, the parallel guidance of the skis and legs.
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You can nicely see how passing through the curves and the connection of individual curves should look like in sequences of photos. You can notice not only the deployment of the pelvis in each turn and the transfer of weight between them, but also the detailed work of the feet.