Originally Posted by comprex
Babies W-sit before they even know the word yoga. We are told that it's a lack of muscle tone and that they will grow both out of that and pigeon-footedness when they gain muscle tone. Fine. Which muscles? Which muscles get so developed that the adult can then become duck-footed and how do we correct the asymmetry?
Just to add one person's data to this question ....
I have always been able to W-sit. I can even lie my back down on the floor as I W-sit. I did not have to work on this; it comes naturally. However, I cannot tailor-sit, and never have been able to. That's so odd, since most people are the opposite. However, I am duck-footed with a vengeance (skis pointed way out when on the lift), and my knees track dramatically inwards when I flex them, on skis or off. Oh, and I supinate. Go figure.
My point? I suspect there's no simple correlation between how you can sit on the floor, static and dynamic foot positions, and how your knees track. I'm of the opinion that Q angle and other bone relationships control this, not ligaments, tendons, and muscles.