Jclayton,
Here is a link to Harald?s writeup from last year: ?For/aft movements to acquire balance?
http://www.realskiers.com/pmtsforum/viewtopic.php?t=77
I am not sure if you saved it, so here it is.
I think you are right in your observations.
It is my understanding that you
do not want explicit forward movement in the hip.
Here is what I understand about it:
Hamstrings are polyarticular (articulate over more than one joint) and contracting hamstring with knee joint fixed will have an effect on the hip called retroversion (in upright standing position retroversion would look like hips move slightly forward). In skiing obviously other joints are not fixed, but some level of impact on the hip joint must be there, especially with flexed knees, and I believe this explains the look. You may also see the lower back slightly curled as a result of (adaptation to) hip retroversion.
Your question about fore-aft balance strategy is a tough one and I do not know the answer.
I will ask Harald when I see him in Montana, unless he finds time to answer your question earlier.
I love sensation of turns when I regain fore balance at the very beginning. For some reason tipping seems to be so much more effective in this position.
On the other hand contracting hamstrings is a tool to bend the skis in the upper C. For this reason, it may make sense to be patient and to get more aggressive with this movement after skis have established the new edges.
I think that some part of the answer largely depends on what you want to accomplish with your turns (speed, GS competition -you need to master it, easy speed controlled turns- you never have to go aft).
My understanding is that valid tools for regaining fore balance are:
- using momentum from previous turn to have CM catch up with the rest of the body (sort moving CM across using shorter line to catch up).
- Contracting hamstring muscles.
The ability to regain fore balance early may also depend on how much forward flex is allowed in your boot. If your buckle your boot tight (top buckle and velcro) just flexing in the end of the turn will result in a bit more aft position.
It also helps me to use a bit shorter poles.
Great question, I am looking forward to reading more discussion on this.
Robert