Probably close to 20 yrs. ago is when I first ran across the concept of the "serape effect." This preceded finding Tom Myers's "Anatomy Trains", and along the same time I found Mel Siff's "PNF" exercise programs, and preceded finding "biotensegrity models."
ALL of which I find related in the sense that they all helped me to better understand how to think about, as I sometimes simply phrase it, "how the body works" in the specific context of throwing/swinging.
Here's a link I cited and talked about quite a few yrs. back about the serape effect:

modernskiracing.com/Serape.pdf
Here's a link I cited and talked about quite a few yrs. back about the serape effect:

modernskiracing.com/Serape.pdf
On biotensegrity:

madelineblack.com/movement-scien…

I think this latter citation does a very good job of outlining/describing this concept in ways that most can grasp pretty well.
Bottom line: It's always good to try to find guys alot smarter than you in an effort to help you become just a little smarter in those things that interest you!

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More from @SteveEnglishbey

4 Jan
I've talked about this before. I think the best physiological/biomechanical explanation is that the back leg action [post contact] is a REACTION to the upper trunk's [arms/bat included] angular momentum.
Said another way: It is a function of the distal component [the back leg] attempt to create greater gyroscopic stability, ie., as the as the trunk leans forward and as the arms/bat go "out and around" to get to the low/outside contact point, the back leg tries...
....to "offset" that action by essentially reacting in the opposite direction.
Read 7 tweets
4 Jan
As always, Paul's comments are very thoughtful and relevant. I want to try to add some context here as regards how to effectively deal with this "disconnection" problem as a teacher.
By "disconnection" I mean that the flawed movement that one is trying to change is a function of a movement pattern that has been done MANY times, and as such it has become AUTOMATED ,ie., not consciously derived/executed.
It may have initially been a function of some type of explicit instruction, eg., "stay back," "swing down", "make your hands quicker",etc., et al, but regardless as to the origin, eventually [via trial/error/repetition], the movement becomes tacitly expressed.
Read 25 tweets
1 Jan
To add some context to my following comments, I would suggest looking at some of my ending comments about motor learning theories in my most recent threadreader post.
Let me say at the outset that I am no novice to books on motor learning/motor control THEORIES [my emphasis because I want to denote that MUCH of the research is simply that ----theory---as opposed to well established physics views on how things work, so to speak].
[Yes I do realize that various aspects of quantum mechanics has muddied the waters, so to speak, but for now I'll simply assert that Newtonian physics is more grounded relative to motor learning theories].
Read 23 tweets
1 Jan
Before I start, I want to thank "Hitters Edge" for putting this up. The real value of a clip like this is that it gives you a rapid compilation of a single hitter swinging at a variety of pitch speeds and locations.
Thus allowing a quick comparison and analysis of the kinds of similarities and differences --within 1 great hitter---that can be gleaned.
Let me add a little context to this clip by saying that these are most certainly not the first clips of Kenny that I have tried to analyze. My guess would be that I have spent at least 100 hrs. [starting at Setpro around 2001] looking at Kenny's swing via slo-mo and real time.
Read 26 tweets
27 Dec 21
Well, without really knowing the author and/or the context of this quote, let me make a few comments.
First this: Based on long experience [that includes "book learning shit", working with all kinds of players, empirical research, thousands of hrs. practicing "doing it"] ,the question of "if" is settled ,i.e., this IS a defining of elite hitters!
And as regards this: "then we must find additional ways to train this skill.”

Well, I can only say that I have been addressing this question [as a teacher] for about 15 or so yrs.
Read 18 tweets
27 Dec 21
The plate as a frame of reference is thoroughly erroneous. From my vantage point, in the context of assessing the contact point in terms of efficiency [conforming to the "Pcrw" standard] THE frame of reference is the hands/knob alignment, relative to the base of support.
"Base of support" meaning the lead leg [half of the base of support], i.e., the lead foot, knee, and upper thigh the combination of which create stability/support of the trunk/arms/bat's rotary motion.
A very key parameter of measuring efficiency or said another way----optimizing connection/maximal momentum transfer from body to bat--- is limiting the displacement of the hands/knob.
Read 19 tweets

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