Walter Ross10 said:A question for everyone here... maybe a bit foolish (likely) 😁
But how can one actually observe their own posture to see if there's an issue? Is that even possible?
By the way, I really enjoy these discussions; regardless of how heated the arguments get, you can still learn quite a bit. 🙂
There are actual instruments used to pinpoint deviations from proper posture. To a trained eye, major imbalances are often obvious just by looking. These tools look like large protractors with scales and gauges, mostly measuring angles and ratios of specific body parts.
When it comes to checking yourself, there are several ways, but perhaps the best starting point would be simple observation—just using your own eyes. 🙂 Here, you can spot certain postural deviations (see the image all the way to the right):
Then, you have geometry issues (kind of like a car's alignment; if the alignment is off, you wear down your tires, wheels, and bearings), along with balance and symmetry issues in most vital parts of the body.

Finally, there's the range of motion for most motor functions; essentially, you can measure someone's reach or flexibility in fundamental strength or mobility exercises. This, in short, is what every trainer and trainee should know when they start working out, because certain exercises carry the risk of causing distorted posture or improper alignment.
There is more to it than that, but these are the basics that can help people track their own progress through training.
Nicole Ross said:In this context, differentiation basically means having a better ability to distinguish which muscle groups are actually firing during a specific movement. It’s about using only the precise muscle you need—rather than letting some other muscle jump in and get in the way when its activity isn't actually helping you achieve what you're trying to do right now.
The whole point of differentiation is to overcome that subconscious muscle tension we deal with during therapy. That tension is caused by SMA. Because of that, you end up with slow, non-essential, and non-lasting changes in how you perceive posture and movement across all the levels those muscles or muscle groups involve. It leads to this constant state of tension that we just get used to—we don't even notice it anymore, except that over time, we start noticing the consequences in the form of chronic pain and worn-out joints.
It makes the muscles hypertonic. Since they're constantly tense as part of the process, they build up lactic acid, which makes them sensitive—and in stronger or longer cases, downright painful. These tensions are unconscious, unnecessary, and persistent; they stem from the subconscious parts of the brain. The focus of therapy is to teach the person how to regain that sensory feeling over the muscles that were subconsciously tense. In doing so, they regain conscious control over the portion of regulation they lost due to SMA.
If, for example, someone has lost 30% of their muscle control, causing that muscle to be constantly "on" at 30%, active therapy can help bring that 30% back. In practice, this means the person can now relax that muscle to almost 0% when they don't need it. This allows the muscle to actually rest and be ready for exertion when needed, rather than getting in the way with useless contractions during movements it shouldn't be part of—or knowing how to linearly relax again when its antagonist pulls.
You can feel this quite beautifully under your fingertips by checking the muscles before and after therapy. And that relaxation comes from one single thing: the return of control. A person feels it even when lying completely still—they can sense themselves differently, like that part of the body feels larger, more alive, warmer...
Then, they can take a muscle from 100% tension down to 0% relaxation, whereas before that range was stuck between 100% and 30%. That's where the reduction and disappearance of pain and movement restrictions come from—things they felt before but didn't know how to change.
You can maintain that regained control through movement. But without active therapy—if you're just doing the same old exercises—you won't get that relaxation below 30%; you'll just stay stuck in that 100% to 30% range. That’s the real difference between differentiation and other therapies. It all boils down to things being able to move freely, which is what ultimately results in freedom.
English isn't my first language, but I think what I'm trying to say is clear enough, and that shouldn't be a reason for any misunderstanding. Another thing is that the site is mainly intended for people who have already undergone active therapy, so it might be a bit harder to follow for someone who hasn't gone through it yet.
Kudos to your effort! I assume you know your profession well, but it might be a good idea to look into the terminology you're using, because in American, English, French, and German, differentiation carries different meanings than your interpretation.
My question is: is there a video that demonstrates the differences between your method and the work of other physical therapists? If not, there's a risk that people might think it's just the same thing (like physical therapy) but with different packaging (using "differentiation" instead of "physical therapy").