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PSIA 大佬 Bob说
rotary movements, like most movements, can be either active or passive, with a whole spectrum in between. "Active," as I use the term here, means that it's a result of your muscular effort--you twist your skis with your feet and legs. "Passive" means something ELSE does the work, and you just let it happen--carving causes your skis to turn, and they turn your feet and legs. The movements themselves can be identical. In good skiing, ACTIVE rotary movements supplement the skis' built-in ability to turn by themselves, as needed.
As we learn to carve better, our steering movements can become less and less active, as the skis do more and more of the work. But all turns, no matter how dynamic, START with nearly flat skis and little pressure (much of the pressure on skis in carved turns comes from resisting centrifugal force. Since there is no centrifugal force at the moment of transition, there will be little pressure as well.) So, unless we just want to make a completely passive "patience turn," we usually need to steer the skis actively into the new turn at first. As the edge angle and pressure increase, the skis start carving more effectively, and muscular steering effort can decrease.
In many turns, that active steering at initiation applies primarily to the inside ski--"right tip right to go right." This movement not only steers the tip of the right ski to the right, it also involves tipping of the ski toward its outside ("little toe") edge, along with a movement of the whole body (CM) into the turn. These movements contribute to the outside (uphill) ski rolling to its INSIDE ("big toe") edge, enabling it to start carving.
So we can clearly steer one foot actively and let the other steer passively at the same time. Whenever you carve a turn 100% balanced on one foot, this is exactly what must happen. The outside ski carves and turns itself. But the only thing that turns the inside ski is ... YOU! Only two-footed carves can take place with no active steering of either foot. |
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