Thank you for the in-depth reply. I have another question however. What is the purpose of the shin connection? I thought one of the defining characteristics of lat sau was "no bridge"? Am I mis-understanding?
Also the chain punching, what is being worked here? Are we learning how to effectively chain punch in this drill? and work off the chain punch? I ask because the Wing Chun that I play doesn't really use the "chain punch" per se... as we tend to use it more as a drill.
Jeez louise dudesky, you ask AWESOME questions. You get my mind thinking about stuff I haven't thought about in years! So first off, thank you for asking REALLY good questions!!!
Ok first off, the shin connection: This can be looked at in a few different ways. In WT, we are always trying to make the situation the most advantageous we can to us. So when you are doing lat-sau (HK) and you step in, if you cannot put your foot straight inbetween your opponents center line (right between his feet) you want to go shin/shin so as to nullify his leg techniques. You learn about this more and more as you advance higher and higher. Alot of these concepts are hidden in the dummy, where you come to understand what is called "Chi-Gerk" or sticky leg. It is something I don't often talk about because most people I know in WT just aren't there and the conecepts are very easy to understand, but they have a lot of depth. The other reason to keep your shin/shin contact in German Lat-sau is because you are always training your stance to be good. Both partners are in their front stance, where you are keeping 100% of your weight on you back leg. This is not to say i'm "floating my front leg; There is weight on the front leg, but it is "dead weight" in other words I am putting no pressure on my front leg so it is easier to move and my opponent can't sweep it. There are footwork drills (Huen bo or "circling steps") that you practice in German Lat-sau, and there are chi-gerk programs for it. But in Leung Ting Wing Tsun, you used to have to be a 4th technician or above to work chi-gerk. So it is considered quite advanced material. It got reduced to 2nd technician material in the last few years, but currently I don't know where it is at, because I am no longer apart of that association.
And I'm not exactly sure how ya'll practice lat-sau, but in HK (Hong Kong) lat-sau, it is ALL about bridging the gap. You have to enter on your opponent, and you can't do that without creating a bridge. I really don't know what information you need for me to explain this, so if you could reply in (either in video or descriptive post) on what exactly you do for lat-sau, maybe I could give you a more sufficient answer
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I think you are misunderstanding part of the key concepts, but you aren't too far off the beaten path, maybe you were just showed only some of Lat-sau. Chain punching is not really the point of any lat-sau drill. Chain punching is what you learn your first week, and you keep practicing this throughout your entire WT learning experience. On of the main things you learn in Lat-sau is TIMING. In german lat-sau (shin/shin) you are learning to deal with different attacks and the first thing you learn is the "off-speed-punch", where your opponent does the cycle and then quickly pak-da's (pak-sau's and then has a very quick punch right behind it). Timing is everything in Lat-sau, it is the main focus. But in chi-sau we learn to feel. So combining timing and feeling, we are at the quite advantageous position in WT.
And thunder, I believe you are a JKD practitioner no? If so, your stance wouldn't allow for some of our techniques, you work out of a SPBkS or "Small Phasic Bent Knee Stance" for all our non-JKD-speaking people who view this thread. In JKD ya'll, we put most of our weight on our front leg, and our back foot has the heel raised off the ground so (fencing stance) so as to give us a very easy method of bursting forward with our stance, and this also allows us to lean back on our heel when someone throws a deep punch at us. So some of the techniques we use in WT literally can't be executed just based on your stance alone. All of the techniques you would learn in HK lat-sau would have to deal with the hands, you can't practice chi-gerk and the footwork drills at all based on the fact that your front leg bears most of your weight, which is a big no-no in traditional WC/WT, but this doesn't mean you can't enjoy or train lat-sau, it just means you have to modify how you use this. God, I would love to train with you sometime and show you what I'm talking about, I think if you learnt traditional WT lat-sau you would have a great time and would really enjoy the material and it would help you understand on a whole new and exiting level when coupled with JKD.
I hope that was a good answer, but please feel free to question it more, I don't have all the answers, I'll be honest, but I do have some good knowledge.
All the best, and thanks for the outstanding questions man!
Jeff