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Erector spinae
Three columns running the length of the back that hold you upright and control how you bend forward.
Latin name: Musculi erector spinae. In plain English, the columns of muscle either side of the spine. It is filed here under chest and back.
Reference information, not a diagnosis. Where a symptom is described below, it is there so you can describe your own more precisely to a clinician — not so you can name what you have.
Where it is
These are the ropes you can feel either side of the spine when you lean back. Anatomists divide them into three columns: iliocostalis nearest the ribs, longissimus in the middle running the highest, and spinalis closest to the spinous processes. All three arise from one thick common tendon anchored to the sacrum and the back of the pelvis, and then send slips upward, each spanning several segments.
Deeper still lie the transversospinales — multifidus, rotatores and their relatives — which are short, segmental and act more like position sensors than as prime movers. The lumbar region is dense with muscle spindles for exactly that reason: the spine needs to know where it is, not only to be held there.
| Feature | Detail |
|---|---|
| Origin | A broad common tendon from the sacrum, the posterior iliac crest, the lumbar and lower thoracic spinous processes and the thoracolumbar fascia |
| Insertion | By successive slips onto the ribs, transverse processes and spinous processes above, up to the skull in the case of longissimus capitis |
| Nerve | Posterior rami of the spinal nerves at each level |
| Main actions | Extension of the spine when both sides work, side flexion when one side works, and controlled lowering of the trunk when bending forward |
What it does
Standing upright is mostly passive, but the moment you lean, reach or carry something in front of you, these muscles resist the fold. Their more important role is eccentric: when you bend forward, they pay out length under control. At full forward bend they usually fall electrically silent — the flexion-relaxation phenomenon — and the load transfers to the ligaments and the thoracolumbar fascia. That handover is normal, and it is often absent in people with persistent back pain.
They also work hard in every carry and every loaded gait cycle, resisting rotation and side bending. This is why single-sided carries and loaded walking train the back so effectively without any bending at all.
Exercises that load it
| Exercise | Category | Muscles the exercise library lists |
|---|---|---|
| Deadlift | Strength | Hamstrings, glutes, back, grip |
| Barbell back squat | Strength | Quads, glutes, core, back |
| Kettlebell swing | Conditioning | Glutes, hamstrings, back, core |
| Bent-over row | Strength | Mid-back, lats, biceps |
| Farmer's carry | Strength | Grip, core, upper back, legs |
The deadlift is the most direct loading: the back extensors hold the spine in position while the hips and knees do the moving. Squats load them isometrically under the bar. Swings load them repeatedly and rhythmically at moderate load. Carries load them in resisting side bending. Nothing here requires a "perfectly neutral" spine, but loads should rise gradually, because the back adapts more slowly than the legs get strong.
How it is lengthened
A knees-to-chest position, a seated forward fold or a child's pose lengthens them. The catch is that back stiffness is frequently a symptom of guarding rather than of short muscles, and stretching a guarded back gives short-lived relief at best. Gentle repeated movement in both directions — flexion and extension — usually does more than one long stretch.
When it goes wrong
| Problem | What it typically feels like | Usual setting |
|---|---|---|
| Non-specific low back pain | A diffuse ache or stiffness across the lower back, often worse in one position and better with movement | Extremely common; often no single cause, and usually improves over weeks |
| Back muscle strain | A sudden catch during a lift or twist, with local spasm and painful movement in one direction | A heavy or awkward lift, often when tired or in an unfamiliar position |
| Radicular pain | Pain running down one leg past the knee, sometimes with numbness or weakness | Nerve root irritation, most often at L4-L5 or L5-S1 |
Get urgent medical help for back pain with numbness in the groin or inner thighs, difficulty passing urine or loss of bladder or bowel control, or weakness in both legs. That combination can mean cauda equina compression and is an emergency. Also see a clinician for back pain after significant trauma, with fever, or with unexplained weight loss.
Nothing on this page is a treatment plan. If a problem is limiting what you do, is not improving, or is getting worse, the right next step is an assessment by a doctor or a physiotherapist who can examine you.
Sources: descriptive anatomy from Gray's Anatomy of the Human Body, 20th US edition (1918), which is in the public domain; Latin names follow Terminologia Anatomica, published by the Federative International Programme for Anatomical Terminology. Nerve root levels are the conventional ranges taught from those sources and vary between individuals and between textbooks. Exercise cross-links use the TempoLife exercise library. Checked 2026-09-06.
Frequently asked questions
Is bending with a rounded back dangerous?
The idea that a rounded spine is inherently unsafe has not held up well. People lift with a range of spinal positions and the strongest predictor of trouble is load that exceeds what the tissue is used to, not the shape of the curve. Building capacity gradually matters more than a single posture rule.
Why does my back tighten up after sitting?
Sustained positions load the same tissues continuously and reduce blood flow through working muscle. The resulting stiffness usually eases within a few minutes of moving, which is a useful sign that it is a loading response rather than damage.
Should I wear a lifting belt?
A belt increases intra-abdominal pressure and can help with maximal loads for trained lifters. It is not a substitute for building strength, and there is no reason to wear one for everyday lifting.
Nearby in this reference
Pectoralis major
The big chest muscle
Latissimus dorsi
The broad muscle of the back
Deltoid
The cap of the shoulder
Rotator cuff
The four small muscles that hold the shoulder in its socket
Trapezius
The big diamond across the upper back and neck
Rhomboids
The straps that pull the shoulder blades together
All 34 body parts · Exercise library · Body map
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