Rethinking Lumbar Flexion: When Protecting the Spine Creates Rigidity

By Jeff Bailey

Lumbar flexion isn’t the problem—it’s what’s been missing.

In many movement and rehab settings, people are trained—with good intentions—to “protect the back” by keeping the lumbar spine neutral, hinging at the hips, strengthening the core, and avoiding spinal rounding. For acute flare-ups, that caution is often helpful and appropriate. But in my experience, when protective rules become permanent, the spine gradually loses movement options. And what we don’t use, we start to lose.

And with regard to the spine, when one segment stops contributing its share of motion, other segments compensate, leading to underuse and overuse, both of which can have deleterious effects on vertebral joints.

The spine thrives on distributed motion

The spine moves by spreading small amounts of motion across many vertebrae and joints. Including rib heads, there are over 100 articulating joints in the spine. When an area becomes restricted, the rest of the spine must adapt around it. In everyday life, this compensation is subtle. Over time, it becomes a pattern that reinforces restrictions, which often lead to chronic pain.

This is especially important when motion is reduced by fusion, whether surgical or natural. Once a segment no longer moves, adjacent segments take on a greater burden because there are fewer moving joints. The load that was once dispersed becomes concentrated, and the adjacent, non-fused joints often become the “workers” for the immobilized region.

Clinically, that means the question is not only “Is this segment stable?” but also: What segments are now doing more than they were designed to do? And what segments are doing less?

When joints stop moving, tissues change

Across biological systems, structures adapt to the demands placed on them—this is especially pronounced for demands that are repeated, and the demands that are omitted.

Most fitness models focus on strengthening and stretching muscles, which often misses the problem. Muscles simply respond to stimuli, so let’s go deeper into the bones, joints, and their surrounding fascia. It’s at the level of bones and joints that we can shift our approach to health and make a lasting difference. After all, people don’t have surgery for muscle replacements. In my experience, the muscles and fascia come along for the ride and become naturally pliant and healthy when we properly target the joints and give them the compression and movement they crave.

Things that stop moving in nature tend to “freeze” or mineralize in place. Hinges rust. Mechanisms seize. In the body, the analogy isn’t perfect—but it points toward a useful clinical lens: reduced motion is often accompanied by changes in tissue quality. Joint spaces can degenerate, soft tissues can become less pliant, and the local environment can become less resilient. We call this arthritis, or degenerative disease, but what if it could be avoided or even reversed by giving the joints the cleansing and remodeling movement and compression they are designed to have?

Over time, reduced joint movement can contribute to calcific change and joint degeneration. In the spine, one serious expression of this process is stenosis, a narrowing of the foramina or canal space that can compromise neural tissues. The point here is not to argue for a simplistic cause (“flexion avoidance causes stenosis”), but to name a plausible and clinically meaningful hypothesis:

When joints chronically avoid movement—flexion, extension, and rotation—tissues may lose adaptability, and adjacent regions may be overburdened by compensation.

The “dark side of the moon” problem

In my experience, most can feel lower back pain, yet the majority have limited awareness of lumbar stiffness. The lumbar region is outside our visual field and often beyond sensory clarity. The thoracolumbar fascia is rich with mechanoreceptors that translate physical deformation (stretch or contraction) into electrical signals, which are then transmitted to the nervous system for motor control. They need to register a change in the tissue to send a signal, which is why someone may experience pain but no indication of rigidity. People automatically and preferentially move where movement is easy and familiar—it could be the hips, thoracic spine, or neck—and avoid what feels dense, guarded, or uncertain.

A common pattern: a lumbar spine stuck in lordosis (extension bias) with compensatory thoracic flexion. It often feels productive to “stretch the upper back,” and may provide immediate relief. But relief isn’t always the same as sustainable health and reorganization. When more mobile areas receive more attention, they often become even more mobile, while less mobile areas remain hidden. In this case, is motion really “lotion?”

Where there’s movement, there is health; so we must isolate and target the fascial restrictions and joints that aren’t moving if we want lasting change. And, we must identify and resolve the compensation patterns that this lack of movement supports.

This matters because many modern movement rules accidentally reward the compensation. One example is the ubiquitous cue in yoga and fitness: “hinge at the hips and keep the spine straight.” Sometimes this is an appropriate strategy. But when it becomes a blanket rule, it can omit a natural, necessary human movement—lumbar flexion—while repeatedly loading the posterior chain, as if mobility and comfort are always a hamstring issue.

I’ve yet to see a rule that doesn’t eventually lead to rigidity, in mind or body.

A caution about hamstrings

Many say, “I have tight hamstrings.” Maybe. But often the sensation of “tight hamstrings” is downstream from something else—ankle rigidity, knee restriction, hip limitation, lumbar guarding, or a protective strategy in the nervous system.

Overstretching hamstrings can also create its own problems: tissues that are repeatedly over-lengthened often respond by increasing tone, guarding, or feeling “tight” as they attempt to recover and restore their stabilizing role as they repair the overstrained fibers. But more relevant to this article, over-stretched hamstrings combined with repeated “hip hinging” promote lordosis rigidity, which, despite good intentions, can lead to stenosis and other degenerative issues down the road. In movement education, it’s worth asking:

Are we repeatedly stretching what is already flexible? Are we missing restricted joint motionthat would unwind compensation patterns and resolve pain?

Clinical takeaway for therapists and educators

This isn’t a call to throw out spinal hygiene or load management. It’s a call to bring nuance back:

• Protective strategies can be useful short term
• Protective strategies can be limiting long-term
• Spinal health requires movement variability, not one “right” posture
• The goal is rarely “more range.” The goal is universal movement throughout the spine and healthy distribution of load and force.
  

Closing thought

Lumbar flexion isn’t the problem—it’s what’s been missing. Sometimes we protect the spine so thoroughly that we remove its natural capacity to function and adapt. Spinal resilience is less about holding one correct posture and more about restoring distributed motion—small, steady, and respectful—so that the nervous system can track with it. The “best posture” is the one that allows the body to organize automatically according to demand in the most efficient relationship to gravity. It’s healthy joint mobility and pliant fascia that make it possible. For those interested in applying these principles in practice, additional guidance can be found through avitayogaonline.com and in my book Mobility for Life.

References (Article 1)

• Panjabi, M.M. (1992). The stabilizing system of the spine (concept of neutral zone). Spine.
• McGill, S.M. (various). Research on spinal loading tolerance and motor control strategies.
• Langevin, H.M. (various). Connective tissue/fascia, mechanobiology, and movement-related tissue adaptation.
• Schleip, R. (various). Fascia as a sensory organ; mechanoreceptors and proprioceptive roles.
• Stecco, C. (various). Fascial anatomy and functional continuities.
• Wilke, J. et al. (various). Force transmission through fascia and connective tissue networks.
• Bailey, J. (2024). Mobility for Life – Healthy Joints, Strong Bones, and A Peaceful Mind with Avita Yoga. Yoga Kaala LLC.