God.in.my.corner, you sure do ask a lot of good questions -- even when I (thin that I) know (part of) the answer they are almost always questions that I have wanted to hear answered, or else should have asked.
My understanding is that this is directly related to power by being the best or at least a good way to maintain balance as you impact.
We must in some way deal Newton's law of equal and opposite reactions; when we exert force on another (or the bag) WE are going to be forced back as much as we transmit force to him -- there is no way out of this, but there are several ways to deal with it.
To be clear, this doesn't mean we must GO BACK, only that there is a force applied to us in the opposite direction of the force we transmit.
Here are a few ways to deal with the force on us, some are better than others, some work better in some situations, and some can be combined:
- Actually move or lean backwards. Obviously, leaning backwards is usually a poor idea, but there are times, usually when pushing off rather than punching, that we want to move backwards as much as move the other person away (e.g., to just get some distance), so using the counter force to push OURSELVES off can be of some (limited?) value.
- Move forward with the punch -- the force still applies to us, but it STOPS our forwards motion rather than actually sending us to the rear. The most obvious problem with this is that we can 'run into HIS punch' and then we are impacted by not only his punch but our own forward momentum adds to it. This doesn't mean it is never used, but it must be used with great caution, care and correct timing and balance.
- Add forward forces ONLY at the time of the punch -- I mean here we don't try to move forward, but only as the punch lands we add something ELSE that WOULD have given us a forward motion, but since we meet that counter force the net result is little or know actual movement in either direction. Ideally the extra force just balances out and we remain "in balance" without having to move forward or back.
- Absorb the force using our muscles, tendons, and ligaments to act as springs -- the overall counter force is the same but the spring action lets us absorb and dissipate it over a longer time and disperse it with more control.
- Translate it into another direction -- either rotation or from our arm turn it towards the ground; this is actually more complicate and done one or more of the other methods, muscles as springs, leaning, or applying another force.
The recommendation for sitting into the punch is about AVOIDING the lean while using gravity and muscle elasticity to turn the horizontal force at the arm/shoulder into a more or less vertical force that can be absorbed by the body, especially the legs, and dissipated into the ground -- friction with the ground also plays a role here.
So we "sit" to avoid leaning; to keep the balance point over the middle of the stance or even a bit to the rear.
The sit not only avoids the lean, it uses the elasticity of our muscles and connective tissue (especially at knees and hips) to turn those forces from horizontal to vertical (dissipating them into the ground and by friction).
Dempsey's drop step is about adding another force (and maybe some momentum if you actually step forward) by using gravity asymmetrically (more on the front foot when you briefly remove it's support from the ground.)
The shoulder whirl (Dempsey describes this too but generally prefers the drop step) using TURNING motion not only to add to the forward impact but to translate between linear (front/back) forces and rotational forces.
Pushing with your back toe and turning the foot for the power hand is another method for adding forward momentum and absorbing the counter force.
Another POSSIBLE use for sitting down is to invoke gravity to create more forces using gravity (from the ground to the opponent and with the counter force back to the ground) -- this is usually done using rotation by having the front knee forward position causing the body to TURN to the inside of your lead hand (only works as I am describing it for the lead hand) -- if you put one foot forward and experiment with "dropping" at the knees (try to get that feeling of FALLING for just a brief part of a second) you will find that the front knee will tend to pull your forward hip forward (rotation) and this get added to the punch if timed correctly, and when you recover you absorb the counter force by using the elasticity of your muscular-skeletal system to rotate back rather than being pushed off balance to the rear.
Tai Chi frequently uses such tricks, and Bruce Lee's (true) 1-inch punch was working largely through this method.
I hope the above makes sense, is useful, and that I didn't mangle it too much by typing it in quickly off the top of my head.
And let's hope we get some really good descriptions and explanations of why it is important from the experts....
--
HerbM


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