Originally Posted by jinx
If you can only flex/extend with a wide stance I suggest looking into some balance excercises. The distance between your legs has nothing to do with the ability to flex your joints!
I've skied in that boot touching narrow stance for a long time. Lateral stability is compromised because the base of support is so narrow. Once stability is compromised, movements in other directions will become more difficult. That's purely a reflex action.
I am far more athletic and mobile without locking one leg to the other, as all six joints are allowed to freely articulate over minor terrain imperfections.
A single piston is not my mental model of my two legs. Two independent pistons is closer. Having independent movement of two legs is far better than forcing them to act as one. Increasing the width of the base of support will give you greater stability than decreasing it.
Yes, you do have to ski with feet together sometimes. And yes, some folks are just built that way -- but not many.
And others are built so they will never ski well with legs together: If your knees tend to track inwards, you will have HUGE problems flexing if you are to hold them together.