Hi Linda! I assume you have read my ski fitness post below, and would like some specifics. Cool!
Many people on this forum swear by inline skating. Although I have not tried it, this does make sense. But I'll let others elaborate on that.
Regarding the "skiers edge", I have heard very mixed reviews, and that is alot of money for something that everybody is not enthusiastic about. Moving down the priceline, you have a similar machine called the Fitter1, http://www.fitter1.com.
But for even less money, you can get a Slide Board, along with some slide videos.
And here comes the ultra budget method of lateral training. You will need a hand towel and a hard wood floor.
Place the towel underneath your left foot, and assume a squat position. As you come out of the squat, slide your left leg to your left leg. Imagine you are slicing the space with your left adductor. Repeat, other side.
If you do not have a stability ball, get one. There are a gazillion exercises you can do with one. A variation on the old "wall sit", which IMHO, promotes static skiing, is to stand against the wall, with the stabilty ball between yor shoulder blades and the wall. Check your knee alignment, they should be facing straight ahead like the headlights of a car. Bend your knees to a 90 degree angle, then straighten slowly. On your last rep, hold at 90 degrees, and make little pulsing movements.
While we are talking about squat like exercises, check out my ski fitness post below for the squats with the fore/aft exercises. Also, if you intend to do some racing, check out my post in Technique about "THE TUCK" I am trying to develop something based on the feedback I've been getting. I will keep you posted.
To prevent ACL injuries, you will need to keep yoour hamstring s strong. Once again, the ball is a good mechanism for this, because it is unstable.
Lie supine with your HEELS on the ball, separated at about pelvic width apart. KEEP ABDOMINALS TIGHT THROUGHOUT THIS EXERCISE!! Gradually, lift your spine into a bridge position. When you get to the top, straighten your legs. Then, come down from the bridge, keeping your legs straight. This time, start the bridge with your legs straight. Bend the knees at the top, and come down with your knees bent. There are ways to make this harder, but lets save them.
For upper body separation/angulation, try this, but very carefully, please. Make sure you are not wearing baggy clothing. Place the ball directly under your right hip. Your feet will need to be anchored against the wall, legs straight, right leg in front of your left. Place the fingers of both hands along the side of your head. Do NOT interlace them! Contract your abs for dear, sweet, precious life, and perform sidebends.
Okay, I'm getting a bit distracted by this Arthur, Genuvierre, Lancelot, tryst on the Mysts of Avalon. Wow, No wonder they did not make a musical out of THIS version of the legend!
More at some other time.
Be Braver in your body, or your luck will leave you. DH Lawrence