Cory wells: I define relaxation in ITF Taekwon-Do as the absence of intentional muscular contraction beyond what is functional or the absence of concentric contractions (i.e. strolling, standing, lifting ones hand, scratching the back of your head, etc.) For example, when stepping forward into a punch, your are not rushing to the target or accelerating your step, which will requires you to use muscular contraction for your quad-sets and hamstrings beyond the functional state of walking (eccentric contractions). When performing sine-wave in ITF, you are learning a new functional motion of stepping which requires you to not pick your foot off the floor, but move it across the floor with the same eccentric contraction used every day. While not everyone does this in the same manner, I believe the principle is the same: eccentric body motion and concentic contractions at the very end. You are not falling into the move, which is isometic (no change in muscle length) as sine-wave require a good deal of control. You are learning to walk properly in order to maximize contractions to move an external force. You and Soo-Shim Kwan like this. Soo-Shim Kwan When performing sine-wave in ITF, you are learning a new functional motion of stepping which requires you to not pick your foot off the floor, but move it across the floor with the same eccentric contraction used every day. -- Nice. I would say that there is some falling going on as the body weight is dropped into the technique (which is a major part of the sine wave motion principle); however, it is a controlled falling. October 3 at 9:03am · Like · 1 Cory Wells IMO the weight dropping is really the contraction of the muscles with speed and balance; weight is constant because mass is constant. The power of the technique is a complex combination of these contractions - from the core muscles; from the slight moving of the trunk along with concentric contraction of the entire body before striking an external force and lets not forget breathing. I dont think a fall is best represents what happens in sine-wave because a fall occurs when you lose your center of gravity (balance) leading to a loss of coordination and control. I think this is why students overcorrect their punches and their shoulders arent straight because moving into the punch as falling does not require balance. Then they try to regain control of their body at the end or as you said controlled falling. A Controlled-fall is used to prevent injury when falling by regaining balance and control of your body; like the exercises we do in class. When I see a fall in an ap-jumok-jerugi, frankly speaking the whole thing looks clumsy because at the end they are trying to regain balance on finishing the technique which to me indicates there is no balance at all. So, I respectfully disagree that there is any falling involved in sine-wave. Sine-wave is learning to move with minimal contraction (relaxing) while distributing your balance in respect to the technique to maximize power using complex accelerated contractions. This is what I see when people do ITF. youtu.be/Wqsx-Jarba4 October 4 at 10:52pm · Edited · Like Tim Swoboda: Looking at technique and Forms executed in three different ways. The sine wave done with an up down motion where the head and body will rise mid step and fall as the foot plants into the technique. This creates imbalance throughout, is not a natural movement, requires timing and invalidates proper breathing. I know this may be popular in many ITF schools but that is my opinion. The second way would be more as shown in the Traditional TKD video Cory posted. Minimal if any up down movement of the head, a relaxed step through and then the concentric contraction of the body mass (the hips, waist, technique and body weight) concluding with the grounding of the stance as you breathe out. I alternate with doing my Forms this way...though less and less...and with the third way which I find feels the strongest and most balanced. The third way would be to align your posture always, set up the technique with intent, step through and firmly plant stance with perfect balance, focus your breathing and direct your energy as you execute the technique. The technique is executed from the set up position to the intended target area....A to B...no in between. The concentric contraction, body mass is lifted (eccentrically) and then twisted (torso, hips) and lowered with the stance firmly planted... into the end of the technique. To me this provides the best power, balance and controlled breathing energy. The difference between the latter two being the executing the technique as the foot plants and planting the foot and then executing. I am actually torn somewhat between the two because the power generated as you step into the technique feels good. Yet it also exposes some balance and breathing shortcomings. Also it can cause you to prematurely activate your technique so you end up only at say 70% of the A to B distance. Yesterday at 1:21am · Like Cory Wells: Your third description suits my liking Tim Swoboda. Haha Yesterday at 1:27am · Unlike · 1 Tim Swoboda: Upon further review of the first video I notice he is lifting his heel to gain body mass movement. I think you can gain that without lifting the heel. Yesterday at 1:29am · Like · 1 Cory Wells:True, theres more force behind a technique when use more of our body respectively. But it takes longer to get from A to B when u raise your foot Yesterday at 1:41am · Edited · Like Soo-Shim Kwan: I dont think the final weight dropping in the sine-wave motion is the contraction of the muscles. You dont need to contract your muscles in order to drop your weight. In fact, quite the opposite. The contraction of muscles contribute to our own acceleration and bodily structure, but when we are talking about dropping of weight in the sine wave sense, then we are referring to the effect of gravity. Grandmaster Rhee Ki Ha describes it in his book: Like a cannonball dropping onto a target, so the downward movement in Sine Wave is this dropping of mass to increase body weight and deliver more power at the moment of impact. We are not talking here about increasing weight, which is impossible, but we are talking about increasing the applied weight in your technique. Does your punch have merely the weight of your arm behind it, or does it involve the weight of your whole body? By dropping our body weight into the technique, we are engaging the whole bodys weight, not just the weight of the attacking limb. And we do this by dropping as Grandmaster Rhee Ki Ha calls it, or controlled falling as I refer to it. And this part of the sine wave involves the engagement of gravity. Or at least, that is my understanding from the various sources Ive read on the topic. Yesterday at 2:53am · Edited · Like · 1 Soo-Shim Kwan: Tim Swoboda, I agree with most of your thoughts too. But I disagree with you an Cory that the up-down in the sine wave motion is purely the result of -- as you put it -- concentric contraction, body mass is lifted (eccentrically) and then twisted (torso, hips) and lowered with the stance. Both what you are saying and what Cory is saying is limiting the function of the sine wave motion to a way of moving while walking, while taking a step. However, the core function of the sine wave motion which is to convert potential energy into kinetic energy (the dropping or falling) part, does not require a step. Sitting stance punching is an example where one merely goes from a higher center of gravity (potential energy) to a lowered center of gravity by momentarily relaxing the knees (potential energy converted into kinetic energy), without the need of any stepping / walking. In other words, the idea of using gravity to increase the force of the technique, which is the maxim of the sine wave motion principle, does not require stepping. Yesterday at 3:24am · Like Tim Swoboda: Soo-Shim Kwan wrote: I dont think the final weight dropping in the sine-wave motion is the contraction of the muscles...and.... But I disagree with you an Cory that the up-down in the sine wave motion is purely the result of -- as you put it -- concentric contraction,... I dont know if that is how my post reads but I would agree with you that the sine wave and the contraction of muscles are two different events... though they should end simultaneously. My contention is that the sine wave need not be overstated....as in 180 pounds dropping from 6 inches is still the same 180 pounds dropping from one inch providing the same additional amount of power on impact. Some interesting history I wish I had paid closer attention to: I first learned TKD from Master Hong Sik Kim in 1973. He was among the exodus of masters who went abroad in the late 60s and early 70s from Korea. He taught almost identical to the style of technique shown in the first video. Let that not be an understatement!! His organization has a strong influence now in the western U.S. however it has become somewhat watered down from what it was... though it has evolved in other ways. All in all, I think the first masters had very similar techniques. In the early 80s I had moved to Arizona for a time. I enrolled in a TKD school there and that Master had also come from Korea though a few years later. When I arrived he had just returned from a TKD summit in Korea ( I believe this was the beginning of the sine wave.) He switched his school over to this new technique. At the time I do not believe it was formally called the sine wave. He described it as dropping your weight into the technique. Sadly, this is all I remember I do not remember for sure if he began teaching the rise other than the natural movement upward with each step...but the drop was definitely the new way it was to be done. One thing I think we all can concur on is that we need to make sure we learn by observing all nuances in movement and technique and not just react to what we hear....otherwise specifics can be lost in translation or just not mentioned altogether. 23 hrs · Like · youtube/watch?v=1HvNC_MBy5w&list=PLA56F5EA2ADDA6073
Posted on: Tue, 07 Oct 2014 06:12:09 +0000
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