Here are a few things that have worked for me:
Use the all mountain master platform, the one with independent feet. Put the platforms on the narrowest setting. Put your feet against the inside lip of each platform--that will cause them to rock to the inside and make you knock-kneed. You have to force your knees apart to make to platforms level--that sets you up in an o-frame stance.
Consciously shift your balance as you "ski" to the outside foot. As soon as you transfer your balance, roll your inside foot to its little toe edge.
Without lifting your feet, pull yourinside foot back against the platform. I focus on a contraction of my hamstring.
Put a mirror in front of you. Keep your navel in one place on a vertical axis and use your hips to go from side to side.
At the end of each "step", pull your outside hip back slightly.
Use the mirror to keep yourself from bobbing up and down as you go up and over from side to side. Flex your legs instead.
Crouch lower on the machine as your legs get stronger.
Finally, rub your stomache and pat your head at the same time
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Randy