By Olle Larsson form Youcanski.comForward body position.
A forward body position entering the turn is of utmost importance. Bakke's forward body position makes the outside ski's front half bend more than the tail. This forward pressure will lead the ski into quick and tight radius carves. This forward body position exerts great pressure on the tibia against the tongue of the boot, which in turn bends the front of the ski. The skier must be able to bend the ankle in the ski boot. However, at a certain point the ski boot must stop bending forward. It is at this time maximum pressure is transferred to the front of the ski. Her pelvis is forward and noticeably ahead of her outside foot. To acquire a forward position the racer must hold the inside foot back. Both tibias are bent forward to almost the same degree.Forward body position by retraction of the outside ski.
Bakke is repeating the same movements except that she retracts her outside ski. There are two common methods to attain a forward body position at the start of the turn. The racer can either extend the leg, which means that the outside leg is bent very little at the knee. (See extension of Mateo Nana in the following photo sequence). Or a second method, which is very effective when the gates are close together giving the racer little time to extend, is to pull the outside foot back. Notice that in frame 5 Bakke's right knee and foot are ahead of her hip. In frame 7 (the last photo) her right foot is now behind her hip. Top racers have developed the ability to either push the ski forward at the end of the turn or pull it back as seen here. The benefit of this action is to produce pressure on the front of the ski by quickly (in 2-3/10's of a second) getting a forward body position with relatively little muscular effort. When the fore and aft body position is ideal the skier can carve turns in a relaxed way. When it is not, the skis must be forced around causing undesirable body stiffness loss of rhythm and decreased ability to absorb changes in the terrain
The photo here shows Fabrizio Tescari from Italy. Heading into a steep pitch Tescari's forward position makes his skis bend from the tip to the tail (third frame). For the skier to advance forward it is essential to hold the inside foot back. Notice that his left foot is leading well ahead of his right foot (downhill foot) in frame 4. The angle of his two lower legs (tibias) is clearly different while in frames 2 and 3 the tibias have almost parallel angles. To acquire a forward body position correctly positioning the uphill foot is very important. If Tescari had started his turn with his uphill foot positioned ahead of the downhill foot, as demonstrated in frame 4, it would have been difficult to generate pressure on the front of the downhill ski. At the start of the turn, the combination of the uphill foot far ahead of the downhill foot and pressure on the uphill ski will stop the skier from getting a forward position.
Now I know the article that these excerpts are form is a little old, but I believe still hold true.