We need to talk about the “Flatten you spine” cue…

If you do multiple movement practices — yoga, Pilates, reformer, group fitness, physical therapy — you've probably received instructions that directly contradict each other.

You may not have noticed. It often happens quietly, embedded in casual cues delivered at a pace that doesn't leave room for questions. But if you've ever left a class with a vague sense that something felt off, or found yourself confused about what your spine is actually supposed to be doing, this might be why.

The contradiction I'm talking about is specific. It has a name. And for anyone managing a spinal condition, understanding it is not optional — it's clinical.

The cue

In some movement practices, particularly classical and mat-based Pilates, you will frequently hear some version of this:

Press your low back into the mat.

Sometimes it's called imprinting. Sometimes it's framed as flattening the lumbar spine. Sometimes it's just a hand on your lower back during an exercise, pressing down, with the implicit message that the natural curve of your spine is something to be corrected.

In yoga — particularly in alignment-based traditions like Iyengar, which is the foundation SAAL Yoga is built on — the instruction is different:

Maintain the natural curve of your lumbar spine. Neutral is not flat.

Same body. Same goal, ostensibly. Opposite directions.

Where imprinting came from — and when it's appropriate

Imprinting is not a bad cue. It was developed for a specific purpose and it works well in that context.

The original intent was corrective: for someone with an exaggerated lumbar curve — hyperlordosis — encouraging the low back to soften toward the mat moves the spine toward a more neutral position. You're taking a spine that is overextended and asking it to release. That's clinically appropriate. The cue is doing real work.

The problem is that the cue migrated. It became a default instruction applied broadly, in most classes, to most students, regardless of whether their spine is hyperlordotic, neutral, or — and this matters — actually hypolordotic, meaning they've already lost their natural lumbar curve.

For the significant portion of adults who have already lost lumbar curvature due to degenerative disc disease, postural changes, or years of prolonged sitting, imprinting is not moving them toward neutral. It is moving them further away from it. It is taking a spine that is already too flat and flattening it further, under load.

That is not a corrective. That is a problem.

What neutral spine actually means

Research on lumbar stability — spanning decades of clinical work by Dr. Jeff Saal and others in the field — consistently demonstrates that maintaining your spine's natural curves — not flattening them — distributes mechanical load more efficiently across multiple structures. When you remove that curve by flattening the lumbar spine, you concentrate force in ways the spine isn't designed to handle repeatedly.

The lumbar spine has a natural inward curve — lordosis — that is not a flaw. It is architecture. The S-curve of the spine is load-distributing engineering: it spreads mechanical force across multiple structures rather than concentrating it in one place. When you remove that curve — by flattening the lumbar spine against a mat — you change how force is distributed. You load the posterior elements of the discs in ways they are not designed to sustain repeatedly.

For a healthy, young spine doing a short Pilates class once a week, this may be a non-issue. For a spine with disc disease, facet degeneration, or post-surgical history doing the same movement pattern regularly — it accumulates. Slowly. And then one day it isn't slow anymore.

Neutral spine is not rigid. It is not a perfect anatomical textbook position that you must maintain at all costs. It is a working range — a zone — where your spine's natural curves are respected and load is distributed appropriately. The goal is to find it, know what it feels like in your body, and work from it rather than around it.

Why this matters more than it sounds

Here is what I want you to understand: this is not a theoretical disagreement between two fitness traditions. It is a clinical one.

The question of where your lumbar spine is positioned during exercise determines which structures are loading, how much, and in what direction. If you have a disc condition and you are regularly performing core exercises in a flattened lumbar position, you may be loading the posterior disc wall repeatedly. If you have facet arthritis and you are compressing your lumbar spine in flexion under load, you may be aggravating structures that could have been protected.

None of this is visible in a group class. The instructor cannot see your disc pathology. The format does not pause to ask. And "modifications available" is not the same as someone knowing which modification your spine specifically needs.

What to do with this

If you are doing Pilates and yoga concurrently — which I think is a legitimate and often excellent combination — here is the practical takeaway:

Know your spine's baseline. Do you tend toward hyperlordosis or have you lost your lumbar curve? If you don't know, that is worth finding out. A skilled practitioner — whether a physical therapist, a physiatrist, or someone like me in a consultation — can assess this in a few minutes. It changes how you receive cues in every class you take for the rest of your life.

When you hear "press your low back into the mat," treat it as a cue to find neutral, not to flatten. For some spines, those are the same thing. For many, they are not.

Tell your instructors what you're working with. A good Pilates instructor, given the information, can reframe the cue for your spine. "Find your neutral" is a more precise instruction than "press down," and any instructor worth their training can offer it.

If your spine has a diagnosis, the question is not just whether an exercise is hard or easy — it's whether the position you're in during that exercise is appropriate for your structure. These are different questions and they don't always have the same answer.

The larger point

Yoga and Pilates are not at war. I do both. I recommend both, in the right context, for the right people. But the "both are great, just listen to your body" answer leaves too much on the table when your body has a clinical history.

The cues you receive in class are designed for a general population. Your spine is specific. Understanding where the two traditions diverge — and why — puts you in a position to use both more intelligently.

That is always the goal.

P.S. If you've been doing Pilates for years and your back has felt progressively tighter rather than stronger, the imprinting cue is one of the first things I look at in a consultation. It is not always the answer. But it comes up more than you'd expect.