Originally Posted by hemingway
Stand on a scale and squat down slightly, then quickly stand upright.
The scale will read a declining value as you stand up, this is up unweighting.Your skis will read the same unweighting as your scale.
That's a bit backwards, but also a bit right.... "as you stand up" - in other words, the motion of extending the legs to stand tall - actually increases the weight on the scale. That's up-weighting. The up-un
weighting happens when you reach the end of the extension. If you do it hard enough, you'll jump completely off the scale and are therefore, completly unweighted. Basically, it's a way to add pressure to the skis. You adjust pressure based on flexing and extending movements.
The reason you sometimes don't want to up-unweight very hard, is that the additional pressure added during the extension can break the edgehold and increase the skidding. this is one reason that cross-under (crap, another term we'll have to define!) became more popular when we went to shaped skis and started carving the place up. The cross under reduced the pressure at the end of the turn, rather than increasing it the way cross over does, keeping the skis in a nice clean carve through the transition. Also, when many people, especially those learning the moves, would do a crossover move, they would many times do it so abruptly, that the skis would come off the ground. Therefore, the start of the new turn has no ski/snow pressure, and no ability to carve or control directon.