Tellner,
Sanchin, just to take Goju Sanchin as an example, covers a very wide range of practices, some harder, some softer and as in most martial discussions is not readily categorized as what the training is.
Evaluating the effects of Sanchin isn’t brain surgery, but it is still more than making assumptions of first year medical students or grad students too. That Sanchin training will have an effect long term on the circulatory system, etc. takes more than just assumptions.
To make an informed decision about any detrimental effects to hard Goju Sanchin practice, without qualified medical research on the issue, there are a number of questions that should be answered first, IMO.
1. Who were the individuals that had their lives shortened because of Sanchin practice? Only by looking at the case histories involved can we determine if there were other factors that might have been the cause too.
2. Who were the individuals that had those hemorrhoids you mentioned that Sanchin was the cause?
3. What was the level of Sanchin practice involved? How frequent, how long in duration, what other physical practices did the individual engage in that might be contributing factors both in karate as well as their lives?
4. Looking at the individual case histories, there are factors such as family traits, etc. that must also be involved.
I’ve associated with Goju stylists for over 30 years who have not evidenced your results. Likewise there are Seniors on Okinawa practicing Goju into their 90’s.
Without such information generalizations about the result of Sanchin training are but conversational logic. If the proof is there I’m not trying to dispute it, I just haven’t seen anything that resembles logical proof to make an assessment about Sanchin training.
It’s not that Western Science can’t convince me, after all I have a Surgeon among my students, it’s just that the science hasn’t been applied to study the way scientific study must take place.
I practice Sanchin differently than we’re discussing. This topic is not a result of my own practice or teachings.
I’ve also read George Mattson talk about Uechi from both a hard and a soft training perspective. Since Mattson Sensei was one of the earliest Uechi Instructors in the states, he claims the very hard Uechi he originally practices was incorrect and while he has worked for some time to soften the practice, there are many who have not come to his understanding.
Of course Sanchin touces on the use of kata. My personal take is Sanchin is to be used.
On the whole I see the use Kata as a combined tool house of technique, open to variable definition as to what a technique within a kata is. I also see kata as a tool to develop the energy in it’s technique execution, the more precise you can execute the greater physical energy you can place within those techniques (also open to variable definition as to what a technique within a kata is).
Then kata is combined with application study, from the early ones to the the more advanced applications to understand the potential. Next the study moves from planned attack to planned attack with variable responses to unplanned attack and unplanned defense with no limitation on techniques, except respect to not use the technique to destroy the other.
All of which is open ended because learning how to bind those developing energies into the applications causes never ending change.
Multiply all of the above by the system of training you actually follow and you’re talking decades of work.
None of which is really necessary, but the effective results of that study provide a lifetime of study into some of karate’s aspects.