Why the “best” position for your back matters more than generic core work

Low back pain is often treated with broad advice: strengthen your core, stretch your hips, avoid bending, rest for a few days, then slowly get moving again. Some of that may help in the right context. But one of the most useful early questions is often missed:

• What position does your spine actually tolerate best?

For many people with low back pain, symptoms are not random. There is often a clear directional preference: one direction of movement or one spinal position that eases symptoms, and another that makes them worse. In the research, this has been closely linked to the phenomenon of centralisation, where pain that has spread into the buttock or leg moves back towards the spine in response to a specific repeated movement or sustained position. These responses are worth paying attention to because they are associated with a better prognosis in low back pain. 

A large systematic review by May, Runge and Aina found that centralisation occurred in around 40% of patients, while directional preference without centralisation occurred in around 26%, meaning that roughly 66% of patients demonstrated one of these clinically useful responses. The same review concluded that centralisation and directional preference are worthwhile indicators of prognosis and should be routinely examined, including in chronic low back pain. 

That does not mean every back pain case can be neatly solved by finding a flexion bias or extension bias. It also does not mean that imaging, strength, sleep, stress, training load or beliefs about pain do not matter. They do. But it does mean that your response to movement can give us a very practical starting point. Rather than guessing, we can assess which positions calm symptoms, which movements reproduce them, and which loading strategies are more likely to be tolerated early on. 

For many people with low back pain, symptoms are not random. There is often a clear directional preference: one direction of movement or one spinal position that eases symptoms, and another that makes them worse.

Why this matters in practice

In clinic, this can change the entire direction of a rehabilitation plan.

If someone feels worse with repeated bending and sitting, but symptoms ease with standing, walking or repeated extension-based movements, that gives us useful information. Equally, if someone feels compressed or aggravated by standing and walking but more comfortable with flexion-biased positions, that matters too. The point is not to force everyone into the same exercise menu. The point is to identify the movement pattern their body currently tolerates best, and use that as a filter for programming.

This is where generic rehabilitation often falls short. A standard sheet of stretches or a blanket “core” routine may ignore whether the person in front of you is becoming less symptomatic, staying the same, or worsening in response to those choices. In contrast, a response-driven approach asks: What happens to the pain during and after this movement? Does it centralise, peripheralise, settle, or flare? That is often far more clinically useful than choosing exercises purely because they are fashionable or familiar. 

What do the guidelines say?

The low back pain clinical practice guideline published in the Journal of Orthopaedic & Sports Physical Therapy supports matching treatment to the person’s presentation rather than defaulting to one-size-fits-all care. Earlier guideline recommendations specifically state that clinicians should consider repeated movements or procedures in a specific direction when that direction is determined by treatment response and helps improve mobility or reduce symptoms. The 2021 update continues that wider classification-based, impairment-informed approach to non-pharmacological management. 

That is an important distinction. The evidence supports assessing for directional preference and centralisation as part of clinical reasoning. It does not prove that every person with a directional preference will do best only with one branded method, nor that these responses are confirmed treatment-effect modifiers in every study. In fact, the 2018 systematic review specifically noted that while directional preference and centralisation are useful prognostic findings, evidence that they act as treatment effect modifiers is still lacking. 

So the sensible clinical interpretation is this: these findings are highly useful, but they should be integrated into a broader assessment rather than treated as ideology.

The low back pain clinical practice guideline published in the Journal of Orthopaedic & Sports Physical Therapy supports matching treatment to the person’s presentation rather than defaulting to one-size-fits-all care.

What this looks like at Unity

At Unity, we do not see rehabilitation and performance as separate things. We use assessment to find out what the body currently tolerates, then build back capacity from there.

That might mean temporarily biasing exercise selection towards positions that reduce symptoms, allow better movement quality and restore confidence. It might mean choosing hinging variations, squat patterns, carries, machine work, aerobic work or floor-based drills according to the person’s current presentation. Then, as irritability reduces and tolerance improves, we gradually expand their options rather than keeping them trapped in a “safe” rehab bubble forever.

In other words, the goal is not just to find a pain-free position. The goal is to use that information to build a bridge back to full function.

For some people, that means returning to gym training without fear of bending. For others, it means walking comfortably, lifting their child, getting through a commute, or playing sport without the same repeated flare-ups. The assessment is quick. The value comes from what you do with the result.

A note of caution

Directional preference is useful, but it is not the whole story.

Not every patient demonstrates a clear preference. Symptoms can change over time. Some people present with more dominant drivers such as high irritability, nerve root involvement, marked deconditioning, inflammatory features, fear of movement, sleep disruption, or broader psychosocial stressors. These still need to be considered carefully.

There is also plenty of debate around why centralisation happens. Some explanations are commonly repeated online with more certainty than the evidence supports. That is why it is better to focus first on what is clinically observable: whether symptoms improve, worsen, move proximally, or spread distally in response to loading. That response is often more useful than forcing a simplistic structural story onto every case.

The practical takeaway

Before prescribing exercises for low back pain, it is worth asking one simple question:

• What position and direction of movement does this person tolerate best right now?

That answer can shape exercise selection, symptom management, load progression and confidence from day one. Sometimes the highest-leverage decision in back pain rehab is not choosing a more advanced exercise. It is choosing the right starting position.

---

References

• George, S.Z., Fritz, J.M., Silfies, S.P., Schneider, M.J., Beneciuk, J.M., Lentz, T.A., Gilliam, J.R., Hendren, S., Norman, K.S. and Interventions for the Management of Acute and Chronic Low Back Pain Revision 2021, 2021. Interventions for the management of acute and chronic low back pain: revision 2021. Journal of Orthopaedic & Sports Physical Therapy, 51(11), pp.CPG1–CPG60. 

• May, S., Runge, N. and Aina, A., 2018. Centralization and directional preference: an updated systematic review with synthesis of previous evidence. Musculoskeletal Science and Practice, 38, pp.53–62. 

• Delitto, A., George, S.Z., Van Dillen, L., Whitman, J.M., Sowa, G., Shekelle, P., Denninger, T.R. and Godges, J.J., 2012. Low back pain: clinical practice guidelines linked to the International Classification of Functioning, Disability, and Health from the Orthopaedic Section of the American Physical Therapy Association. Journal of Orthopaedic & Sports Physical Therapy, 42(4), pp.A1–A57.