That is not obvious in the slightest. In fact, it has no empirical support.
Ok then.
As has been previously discussed, any time you use a muscle, resistance is involved. Even when you are sitting or standing, you are using muscles to resist against the pull of gravity.
True but I am not denying that some muscle contraction is required. However there will be a minimum amount of muscle contraction that will be required to, for example, stand in your stance or hold a tan sau. Most people will use more tension than they need to just hold it which is a waste and can potentially be used against you.
I can see that what I wrote didn't very clearly convey what I was trying to say as I was at work & so wrote it in a bit of a hurry. Now I'm home I'll do my best to make it clearer. When someone pushes against you, the natural reaction is to tense up and push back. When weight training you do a similar thing to lift the weight. However if you are trying to train your Wing Chun so that you don't tense up and/or push back when someone pushes on you then weight training is not a good thing as it will kind of untrain the very thing you are training for in Wing Chun - not tensing up.
Instead, when I train I want to set my body structure and angle in such a way that I am using less, and ideally the minimum, amount of muscle tension possible to hold structure against the force is being exerted on me. Then I can feel the precise direction of their force, redirect it, hit, whatever a'la chi sau. I see this as ONE WAY that a weaker person can overcome a stronger opponent and something that can be done even in old age when muscles are not as strong as when a person is younger.
What? Sorry, but this is unscientific. Force and energy are scientific terms with very specific meanings, and I seem them being bandied about here in a very odd manner.
I think that energy and force tend to be used interchangeably in the context of Wing Chun. I was trying to explain the quote in terms of force as opposed to energy as that appears (according to
http://en.wikipedia.org/wiki/Force) to be a more correct term in the scientific context that you are coming from.
I don't have any scientific proof of the fact that correct body structure redirects the force that someone might push on you with down to the ground. However in my experience when my structure is correct and someone pushes hard on it I am still relaxed, don't move & yet can feel additional pressure on the bottom of my feet. If I tense up I get pushed back or have to step back before I topple. I don't have a scientific explanation for this however I don't need one to decide which method I think is better for me by allowing me to easily deal with someone that is stronger than me.
This is known as a truism. Since we do not levitate, our mass is always supported by the ground.
Not strictly true as we do have the ability to jump, but I know that's not the point you are trying to make.
Again, I think I wrote my post a bit quickly to be crystal clear in my explanation. When you strike someone, if your body structure is correct then they will bear the full brunt of the strike. You will have your bodyweight behind the strike and will be properly supported by the ground so you do not move yourself backwards or unbalance yourself in the slightest. If your body structure is not correct then, depending on how hard you hit & how bad your structure is, you can end up pushing yourself back thus the opponent does not take the full force of the strike.
I guess that the best illustration I can think of for this is standing in YGKYM and palm striking a wall. If your structure is good you won't sway backwards when you hit it. If you could hit the wall hard enough it would crack. However if your structure was bad and you hit with the same force I don't expect that the wall would crack & you'd probably fall backwards. However to hit it with the same force and bad structure I would expect would require more muscle power and/or speed to make up for there being less mass behind the strike. Note that I am not stating this as scientific fact - you are in a significantly better position to do that than me - I am just saying that is what I expect is the case. Again though, whatever the scientific fact is, it doesn't change my actual experience of striking with and without bad structure and the effect both have on a person holding a pad.
I don't understand what you are attempting to establish here. You are confusing effort with muscle mass. Lifting 10 lbs is nearly effortless to me, but impossible for my 2.5 year old son because of my superior muscle mass. Do you wish to say that a stronger muscle would make your punches less effortless?
Nope. What I was trying to say is that when I strike a pad, if I "try" to hit the pad as hard as possible I end up tensing my punching muscles more and don't actually hit the pad as hard as when I am more relaxed and I just hit it. When I hit in a relaxed way then yes, it is less effort, because I'm using less muscle contraction. I am not as strong as I was when I started Wing Chun due to stopping weight training. Consequently I now have less muscle mass yet I hit harder than I ever have before despite having done numerous other striking arts over the last 10 years before taking up Wing Chun. Might be a coincidence that now I have less muscle I can relax more & hit harder, might not.
Anyway, I'm not going to write any more on this subject as, aside from the fact that is isn't actually on the original thread topic, I don't expect that we will convince each other either way. Not that it presents a problem to me that my, and other people's explanations, don't stand up to your scientific scrutiny (I've no doubt the feeling is mutual). For me the proof is in the pudding - I have found something that works very well for me at the moment and have just tried to convey it as clearly as I could.