Most skiers get told one time or another by a coach that there is too much upper body or hip rotation in their skiing. This usually gives the skier a weaker edge support in the turn and poor body positioning over the skis. The result – A vulnerable and weaker set up for overall dynamic balance. Upper body or hip rotation is usually more apparent in one direction. Steering needs to come mainly from the legs with the balls of the femur rotating inside the socket joint of the hips. This allows the legs to steer past the fall line without the hips and upper body interfering.
In most cases skiers can step their feet around approximately 50 or 60 degrees across either side from the fall line. This means that when they steer from turn to turn and the steering of the skis is greater than say 50 or 60 degrees, the upper body will start to rotate.