Have you ever noticed something strange about how baseball people talk about hitting and throwing?

On one hand, everyone agrees no two swings should look alike. Nobody wants a cookie-cutter mechanic stamped onto every kid who walks into a cage. On the other hand, every serious hitting coach, every strength coach, every movement guy — including me — talks about training the same handful of things in every single athlete. Rotation. Balance. Coordination. Front-side stability. Backside power.

So which is it? Should every player move differently, or should we be training the same things into everybody?

Here's the honest answer: both. And once you understand why, you'll never look at "individualized training" the same way again.

The confusion is real, and it's not your fault

I hear parents say some version of this constantly. "I don't want my son's swing to look like everyone else's." Then, in the next breath, they ask what specific exercises will fix his hips.

That's not a contradiction on their part. It's a sign the industry has never clearly separated two things that get talked about as if they're one thing: what a body has to accomplish, and what a body looks like accomplishing it.

Principles are not patterns

Here's the distinction that resolves the whole thing.

A principle is a functional requirement. It's something every efficient athletic movement has to satisfy, no matter who's doing it. You have to stabilize a base before you can rotate around it. You have to create separation between your lower half and upper half to generate real power. You have to decelerate what you just accelerated, or the body pays for it somewhere else. These aren't style choices. They're movement facts, the same way gravity is a fact.

A pattern is the specific, visible shape a body uses to satisfy that principle. And this is where the individuality actually lives.

Watch a submarine pitcher and an over-the-top pitcher side by side. On the surface, nothing about them looks similar. But strip away the arm slot and look underneath — both of them are creating hip-shoulder separation. Both of them are decelerating the arm safely. Both of them are satisfying the exact same principles. Their bodies just wrote two completely different patterns to get there, because a submarine pitcher's shoulders, hips, and history aren't the over-the-top pitcher's shoulders, hips, and history.

Same for two hitters standing in the box. One has long levers and a narrower base. One is built low and compact. Ask both of them to create backside power, and you will get two different-looking swings — because you asked for the same principle, not the same pattern, and their bodies are different constraints acting on that principle.

Where the confusion actually causes damage

This is the part that matters for how your son actually gets coached.

A coach who doesn't understand this distinction does one of two things, and both are wrong in opposite directions.

Some coaches skip the principles entirely, in the name of "letting him be himself." No rotation work. No stability work. No real demand on the body. That's not individualized training. That's just an absence of training, dressed up as freedom.

Other coaches do the opposite — they mistake the pattern for the principle, and try to install their own pattern into every athlete who walks in the door. Same stance. Same load. Same hand position, regardless of the body underneath it. That's the cookie-cutter problem everyone already knows to be afraid of.

The actual answer sits between both mistakes: train the principle, and let the athlete's own constraints write the pattern. You demand rotation, stability, and power from every single kid. You never hand any of them a photo of what it's supposed to look like when they're done.

The science behind this isn't new — it's just rarely explained this way

This distinction has a real name in motor learning research. It goes back to a framework called generalized motor program theory, and it separates every skilled movement into two parts: invariant features and parameters.

Invariant features are the relative timing and sequencing that stay constant no matter who's performing the skill or how fast they're doing it — hips before shoulders, always, in that order, whether the swing is slow in the cage or explosive against a 90 mile-an-hour fastball. That sequencing doesn't change. It's the closest thing motor learning has to a fixed rule.

Parameters are everything that scales to the individual — the specific force, the specific timing, the specific muscles recruited to actually execute that sequence. Two athletes can share the exact same invariant sequencing and look completely different, because their parameters — their bodies — are different.

There's a second framework, one I've referenced before in this newsletter, that explains why the parameters end up looking so different from athlete to athlete: Karl Newell's constraints model. Every movement solution gets shaped by three kinds of constraints working together — the athlete's own body (his limb length, his mobility, his strength), the environment (the pitch, the count, the field), and the task itself (get the barrel to the ball). Change any of those constraints and the body finds a new pattern, even while satisfying the exact same underlying principle.

Put those two frameworks together and you get the whole answer. The invariant features — the principles — are what we train identically in every athlete. The parameters — the pattern — emerge from each athlete's own constraints, and we don't touch them.

How this fits the pyramid

If you've been reading this newsletter for a while, this will click into something you've already seen.

The foundation of the Baseball Flows Development Pyramid — Movement Capacity — is where the principles live. Rotation. Balance. Coordination. Stability. Power. That layer is genuinely universal. Every athlete who walks through the door needs it built, full stop, with no exceptions and no personalization.

The top of the pyramid — Baseball Skills — is where the pattern shows up. His stance. His load. His bat path. His arm slot. Same foundation, underneath every single athlete we train. Never the same building on top of it.

That's not a contradiction in how we coach. That's the whole design.

What this means for your son

The next time someone tells you individualized training means "just let him figure it out," or, on the other end, hands you a mechanical checklist meant to make him look like every other kid in the program — both of those are missing half the picture.

The real question to ask any coach, any program, any training system: are you training the same principles in every athlete, and letting each athlete's own body write the pattern? If the answer is yes to both halves, you're in the right place. If it's only one half, something's missing.

We train the same principles in every athlete. We never coach the same pattern into two of them.

That's not a slogan. It's how the whole system is built.

P.S. This is exactly what the Development Pyramid inside Baseball Flows is built around — the same movement principles trained for every athlete, with room for his own pattern to emerge. BaseballFlows.com 

Ask yourself this:

If the game sped up tomorrow…

would your player move freely or tighten up?

If that question matters to you, explore further.

Parents → 👉 www.baseballflows.com

Coaches → Baseball Flows (Level 1 Certification): Global Patterns Screening (GPS)

Move Better.

Play Better.

— Dr. Ismael Gallo, DPT

Founder, Baseball Flows

Building the athletic foundation beneath the uniform.