Stable. Strong in one's stance. Basically immovable when confronted with oncoming power/energy/force.
Never go backwards...always be moving forward.
And what about the power on your wing chun strikes?
Since the punches are thrown basically/usually from the elbows-in position and without the same kind of torque from the hips and shoulders that a boxer might use - they are structurally somewhat less powerful than say a boxers hook or rear cross.
How do we make up for that?
Well besides a relaxed but whip-like energy flow through the body and out to the hands/legs - it's done with an explosive driving move from the ground (legs) that jolts the middle of your body forward (and with a slight torque) - putting power into your elbow and therefore the outgoing force is directly behind the striking hand(s) as you push/throw your elbows/hands forward....like the way Rene described Alan's body motion as a: ) rather than as a lean: /
Right?
Now read once again two seemingly different points of view - the first by Phil Redmond...and the second by Robert Chu:
"Real fighting is dynamic. I'd have no reason to test to see if I could stand square on while someone pushed me in the chest. It's just like the Tai Chi Sifus who have many people push on their stance. It looks impressive to laypersons but how would you use that in the ring or in a fight against a much stronger opponent who is coming at you? It just doesn't make sense.
I'd rather be moving to avoid force and while striking. Developing dynamic/moving structure should be the goal if you're going to fight. But I guess I'll be accused of having no structure but I'm good with that because I've been very successful with the approach." (Phil)
..........................................
"Fighting is fighting, structure is structure. In WCK we learn structure so we can have the powerbase to fight with, as it is the source of our power. Its no different from a shot put thrower using his body to generate force to launch the shotput, or being a stable base to use a rocket launcher. If someone can't stand stable, the rocket will go awry. Hope these analogies make things clearer.
I think we shouldn't cop out and think WCK sucks and has no power and that we only have to shift or do MMA, or do some other system to launch WCK tools. Otherwise, our system sucks and WCK is just BS - just a bunch of empty close quarter hand skills put on an unstable base." (Robert)
***NOW HERE'S MY TAKE on all of this: both views need to be incorporated within one's wing chun. One of the biggest benefits of chi sao training is to integrate what you learned in horse/stance/SLT...(stability)...with the ability to move in any direction (including backwards) WHEN THE SITUATION CALLS FOR IT.
The trick is to not give way, half sidestep, full sidestep, etc. - WHEN ALREADY ENGAGED AGAINST HIS FORCE, ie.- there's significant limb-to-limb, or body-to-body contact already in play...unless you have to.
You must link your arms to the rest of your body such that the info gathered in your arms instantly translates into an almost subconscious decision to move - or not move...and if so...how far? and in what direction?
And Why?
(ie.- because now I have his flank and can hit/kick/grab him while momentarily he can't hit/kick/grab me). As one example. Another: it's time to explode forward and hit him with a barrage of strikes on the lines that are now open to me - and do it with lots of forward energy coming off a stable power base that ultilizes my entire body alignment attacking one given point on his body. (So that I'm not just throwing arm punches).
And of course you need the strong stance and stable powerbase to hit with power and to keep the pressure on (so it's him who's going backwards)...as well as to keep yourself rooted when up against someone who's trying to unbalance you.
But wing chun also teaches to avoid fighting force directly with force. Hence avoidance moves, energy release/redirection moves, shifty and interruptable footwork, triangle steps, various sidesteps, etc.
Chi sao greatly helps with the the development of these skills (in the hands, arms, legs, torso) - but must be supplemented by working more spontaneously from a non-contact starting point.
And then Shakespeare would be proud.