In recent years, some of the worlds best slalom skiers have started making upper-body rotation movements in the transition, but their purpose is to set the torso up early for the next turns control phase rather than to power a redirection of the skis.
Upper-body rotation involves projecting the outside arm, shoulder, or both in direction of the intended turn. The movement starts with a preparation phase in which the arm and shoulder are drawn back. this is followed by a projection phase in which the arm, possibly followed by the shoulder and even the hip, is thrown forward and around in the direction of the new turn. Once the thrown upper body segments have gained some momentum, they are caught by the contraction of appropriate muscles in the blocking phase, locking them to the rest of the body. This transfers the momentum of the projected body segments to the rest of body and the skis as a torque.
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