Because many skiers do not realize how much propulsion they can gain through the proper use of their upper-body muscle groups, they do not realize the importance of their ski poles, nor do they recognize the value of using the right poles. Pole length is very important, because it can affect the skier's form and relaxation. Using poles that are too long will force the skier to arch his or her back too much and project the body up instead of up and over the trail. Using poles that are too short will cause the skier to sit back, thus limiting his or her ability to achieve a good, forward lean and appropriate body position. For classic cross-country skiing, a properly sized pole will extend from the ground to an area somewhere between the armpit and the rounding of the shoulder.
Some skiers cut corners and purchase inexpensive flexible poles.
As a result, much of the positive energy generated by poling action is lost to the pole. A stiff-shaft pole will allow more effective transfer of power and more propulsion. If extra poles are scarce, you may wish to encourage those students to pick up better poles at a nearby rental shop. You'll also want to make sure the pole straps are properly adjusted. Since the classic stride calls for the skier to push against the strap rather than the pole itself, the pole strap should be tight enough to hold the pole close to the crook of the thumb and forefinger, but loose enough to allow the student to open his or her hand and follow through with the poling motion.