IMO the stance does a few things and probably more than I know..
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It introduces/trains body alignment (both sides) from the ground/feet up through all the joints and into the arms..
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The knees in help protect the groin from attack in this or any other WCK stance…
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The feet in can be used for hooking the opponent’s feet.
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The stance trains/introduces ‘loading the springs’/compressing the structure/sinking for making power.
NOTE: WCK is not the only classical art that used this kind of odd toe in stance…
IMO the classical system or some of them advocated using a neutral fighting stance when facing off, outside range, something I never really got used to for sport.
The square position is also seen, although it doesn’t stay, in close range fighting. When those labeled good WCK folks use this stance you dont normally see it done exactly as it is seen in the form, toes in, and instead its more loose and natural.
The stances can help start a base for the mechanics that are used in the system, this can be seen more in the chum kiu ‘stance’ since the stepping mechanics are actually done in the form..
If you ask some people they will even tell you this stance has magic qualities that will prevent you from being moved.. :rolleyes:
In reality no stance in real fighting will remain staticthere are no static stances in fighting per se.. This is where some of the problems with stances come into play because people think theyre training to fight as if their feet are glued to the floor/and or are plane spotting…
In an assault situation you never know how you will be standing however, or if you’ll be able to move/step at all, and assume a proper fighting posture, etc.. So IMO this basic stance is showing you how to align the body for making power from almost any natural standing position; something you see many good WCK people doingthey don’t adopt the exact stance but use the alignment and loading taught in the stance to make power. If you look at Gary Lam or Ip man, they are often doing their thing and using no particular stance, still the core alignment and power is there.
Moreover, this stance converts into the chum kiu stance and back again to change lines/angles align the structure, absorb power, redirect power, make power and so on.. You can see some of the variations demonstrated in Wing Chun the Science of Infighting with WSLbut to see the stance you will need to freeze the video, otherwise youll miss it. Whats interesting about stances is what happens during the transition, the movement, the mechanics, the changes, of those stances, and then there is no particular stance.