I have notissed in many threads here at epic that many of uss not familiar with this consept struggle with the definition of the SLF. I have here quoted Pierre, hope he doesent mind, from an other thread and hopefully we will get a good discussion going.
Originally Posted by Pierre
The Fast Line Slow method is really the natural default method. Virtually all skiers default to this method. The primary modus is to control speed while going in the general direction that you would like to go.
When done smoothly the skis accelerate in the top part of the turn and deccelerate in the bottom half of the turn. The hips move in an upside down U shape. That means that the hips are back behind the feet in the second half of the turn, go forward and up for release and then back behind the feet again at the fall line for the second half of the turn. The primary rotary mechanism is fulcrum turning of the feet through the hip socket. This rotary mechanism combined with the hip movements produce counter and movements towards the outside ski. You can produce clean RR track turns using this method if some banking and excess counter are employed. The Fast Line Slow method in very intuitive to all skiers.
The Slow Line Fast method employs movement patterns that are opposite of those for the Fast Line Slow method. Here the modus is essentially applying no brakes with no intention of controlling speed. The pure intention is to select a line that both goes were you want to go and results in a speed that is within your comfort zone.
When done smoothly the hips stay up over the feet during all phases of the turn and all movements are forward into the future turn. The only reason to let the hips fall behind is to apply the brakes. The skis accelerate throughout the entire time they are moving into and through the fall line. Line is controlled by the timming, intensity and plan of action. You always feel as if the skis are not going fast enough. The slower you initiate the turn, the slower the skis go. The skis still accelerate through the turn but the timming and intensity has changed the size and the speed. The primary rotary mechanism is differential braking set up through pressure and edge control and coordinated and assisted through the body core. The inside ski is pressured and tipped to increase its drag slightly more than the outside ski. This lets the outside ski run faster and travel the outside of the turn at a higher rate. The skis track tail to tip with counter only being generated as a function of apparent slope. The skis are guided as a fine tuning to the primary rotary mechanism. The distance between the skis does not change throughout the turn even when edge angles are low and both skis are drifting a bit. Pressure and weight take care of themselves with little input from the upper body. Body angles are progressive and generated naturally.
The Slow Line Fast movement patterns seem very counter intuitive to most skiers at first. Most skier will revert back to the Fast Line Slow in the absence of continued Slow line coaching.