A common trait of intermediate skiers is whole body rotation - also known as doing too much work . The skier may turn the whole body as a unit, so that the torso is always square to the skis. Or, they might generate rotation with upper body force - so that the shoulders turn more than the feet. There are lots of ski instructor drills to develop more effective movements - some of these drills focus on stabilizing the upper body - hold a tray, hold the poles flat, etc. I often find that its more successful to help skiers learn to steer with rotary movements of the feet and legs independent of the upper body - once these skills are developed, upper body stability can be enhanced afterward. When we want to help develop independent leg steering, don't be afraid to go back to the basics - many of the exercises I use are similar to those in most beginner progressions . Then, build the progression or lesson around what the student is capable of and their succ...