I assume you are talking about snowblades, like Salomons or Volkl double Troubles.
If you want to truly get your fore aft balance correct and revolutionize your skiing to a wider (get rid of the old school) two footed inclinated and angulated balanced stance go spend a couple of hours on these. I own 2 pair of Volkl double Trouble.
They do not work (one will start to wag like a happy Chihuahua's tail) if you are not on them just right laterally. And if your are ot on them balanced fore/aft you are on your ass.
You get really good, really quickly at keeping these thinigs from happening.
Best cure in the world for diverging skis , non parallel knees, skiing your skis and from the tails and skiing too naroow.
also you don't use poles!
Go try 'em! From the comments you, have no idea what these things can do for your skiing.