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Movement
Intermediate
8 min read
Kinetic atlas

Rotation

The only pattern that plays out in the horizontal plane. The range comes from the hips and the thoracic spine, hardly at all from the lumbar — and confusing the two changes everything.
The muscles of rotation
Starting position
Current phase

Starting position

0 s
Feet on the ground, pelvis and shoulders aligned, trunk braced before the movement.
Put it into practice in Shapier
Open the russian twists exercise page in Shapier, the exercise that puts trunk rotation into practice.
See the russian twists exercise
Muscle roles in a rotation to the left
Trunk driver
External oblique · Internal oblique
Transmission
Latissimus dorsi, through the arm · Erector spinae, holding back
Origin of movement
Glutes and hip rotators · Adductors, controlling

The pattern that was missing

The other eight families in the pillar play out in the sagittal or frontal plane: you bend, extend, push, pull, carry. Rotation is the only one that happens in the horizontal plane, and it is also the one whose origin is most often misplaced.
Transverse plane
The plane separating the body into an upper and a lower half. Movements in it are rotations about the vertical axis.
horizontal plane

Where the range comes from

Turning the trunk looks like a movement of the back. In reality three contributions add up, and they do not carry the same weight.
  • The hips supply a large share as soon as the feet are on the ground: the pelvis turns on the femurs, and the whole trunk follows without a single vertebra having moved.
  • The thoracic spine allows real rotation between vertebrae, its joint surfaces being oriented for it.
  • The lumbar spine allows very little. The orientation of its posterior joints directs it towards flexion and extension, not rotation.
Certainty level · Established
The lumbar spine allows far less rotation than the thoracic spine, because of the orientation of its posterior joints.
Descriptive anatomy and kinesiology give the same cause: the lumbar joint surfaces are oriented to guide flexion and extension. The figures for range vary with the measurement method and the starting position, but the gap between the two levels is consistent across sources.
Neumann DA (2016) · Standring S (2020)
That distribution has a practical consequence: an instruction to "rotate the torso" produces a movement whose bulk happens somewhere other than where it is felt. The lumbar spine follows; it does not lead.

Who produces the movement

Muscle roles in a rotation to the left

Role
Right side
Left side
Trunk driver
External oblique
Internal oblique
Transmission
Latissimus dorsi, through the arm
Erector spinae, holding back
Origin of movement
Glutes and hip rotators
Adductors, controlling
Holding
Abdominal wall, throughout
Abdominal wall, throughout
The two obliques work as a crossed pair: the external oblique on one side with the internal oblique on the other. It is that diagonal arrangement, described on the abdominal wall page, that produces rotation.
Certainty level · Probable
The muscles framing the spine take part in transmitting force between the lower and upper body during rotation.
The review on core training describes that transmission role and distinguishes endurance from maximal strength. It does not separately measure each muscle's contribution in a given rotation, and turning it into conduct for a person goes beyond what it establishes.
McGill SM (2010)

The phases of the movement

A controlled rotation, phase by phase

  • 1
    Starting position
    0 s
    Feet on the ground, pelvis and shoulders aligned, trunk braced before the movement.
  • 2
    Turning
    concentric phase
    The standing hip pivots, the pelvis follows, the crossed obliques shorten.
  • 3
    End of range
    transition
    The thoracic spine completes the rotation; the lumbar spine contributes almost nothing.
  • 4
    Return
    eccentric phase
    The opposite obliques brake the return; the pelvis comes back before the shoulders.

Common misreadings

Caution
Three beliefs about rotation
That rotation comes from the lumbar spine. The most stubborn one, and anatomy contradicts it: the orientation of the lumbar posterior joints guides flexion, not rotation.
That it is an arm movement. The arms move because the trunk turns. They do not produce the rotation, they mark its extent.
That the range reached measures a quality. It depends on available hip mobility and on the orientation of the joint surfaces, both of which vary between people.

Seeing the structures involved

The muscles of rotation

The scene shows the abdominal wall, of which the obliques are part, and the groups around it. The rotation itself is not animated: the obliques appear as one whole, without their fibre direction being distinguished. Without the 3D, the essentials fit in one sentence: two sheets crossed diagonally, pulling the chest one way while the pelvis stays the other.
Current step
Anterior view
The front of the body. Pectoralis major covers the upper chest, the deltoid caps the shoulder, the biceps fills the front of the arm, the abdominal wall links the ribs to the pelvis, and the quadriceps fills the front of the thigh. Further out on the limbs, the forearm muscles drive the wrist and hand, and tibialis anterior lifts the foot.
Scene description
A three-dimensional diagram of a standing human body, arms by the sides, built from simplified paper-coloured volumes. Twelve priority muscle groups are laid over this outline in terracotta: at the front, pectoralis major, the deltoid, biceps brachii, the abdominal wall and the quadriceps; at the back, the trapezius, latissimus dorsi, the erector spinae, triceps brachii, the glutes, the hamstrings and the calves. A simplified skeleton — skull, spine, ribcage, pelvis, humerus, femur and tibia — can be shown beneath the outline to reveal the bony levers these muscles pull on. Each group is selectable and opens its own reference page. This is a teaching diagram with stylised volumes, not an exact anatomical reconstruction.
Visible structures
  • Pectoralis major
    A thick sheet running from the clavicle, the sternum and the upper costal cartilages to the lateral lip of the bicipital groove of the humerus. It draws the arm towards the midline and forwards, and drives horizontal pushing.
  • Deltoids
    Three heads — anterior, lateral and posterior — running from the clavicle, the acromion and the spine of the scapula to the deltoid tuberosity of the humerus. Together they raise the arm; separately they carry it forwards, out to the side or backwards.
  • Biceps brachii
    Two heads arising from the scapula — the supraglenoid tubercle and the coracoid process — joining on the radial tuberosity. It flexes the elbow and supinates the forearm, and contributes to every pulling movement.
  • Abdominal wall
    Rectus abdominis, the external and internal obliques and transversus, running from the ribs and sternum to the pubis and iliac crest. They flex and rotate the trunk and, above all, stabilise the spine by regulating intra-abdominal pressure.
  • Quadriceps
    Four heads — rectus femoris, vastus lateralis, vastus medialis and vastus intermedius — joining through the quadriceps tendon onto the patella and then the tibial tuberosity. They extend the knee, and rectus femoris also flexes the hip.
  • Trapezius
    A diamond-shaped muscle spanning from the occiput and the cervical and thoracic spinous processes to the clavicle, the acromion and the spine of the scapula. Its upper, middle and lower portions elevate, retract and depress the scapula.
  • Latissimus dorsi
    A broad fan arising from the lower thoracic vertebrae, the thoracolumbar fascia, the iliac crest and the lowest ribs, converging on the bicipital groove of the humerus. It pulls the arm down and back, and drives vertical pulling.
  • Erector spinae
    Muscular columns — iliocostalis, longissimus and spinalis — running from the sacrum and iliac crest to the ribs, the vertebrae and the skull, on either side of the spinous processes. They extend the spine and control the trunk as it lowers.
  • Triceps brachii
    Three heads — long, lateral and medial — arising from the scapula and the back of the humerus and joining on the olecranon of the ulna. It extends the elbow, and its long head also assists shoulder extension.
  • Glutes
    Gluteus maximus, medius and minimus, arising from the iliac wing and the sacrum and inserting on the femur and the iliotibial tract. They extend, abduct and rotate the hip, and drive the pelvis upright in the hinge and the squat.
  • Hamstrings
    Biceps femoris, semitendinosus and semimembranosus, running from the ischial tuberosity to the tibia and fibula. They extend the hip and flex the knee, and control the trunk as it lowers in the hip hinge.
  • Calves
    The gastrocnemius and soleus, joining through the Achilles tendon onto the calcaneus. They plantarflex the ankle, and the gastrocnemius, which crosses the knee, also assists knee flexion.
  • Rotator cuff
    Four short muscles running from the shoulder blade to the top of the humerus. Their tendons merge into a sheet that holds the head of the bone against its socket while the deltoid moves the arm.
  • Serratus anterior
    A sheet hooked onto the upper ribs by triangular slips, passing under the shoulder blade and attaching to its inner border. It holds the blade against the ribcage and rotates it.
  • Iliopsoas
    The only muscle linking the lumbar spine directly to the femur. It descends from the vertebrae and the iliac fossa, curves around the rim of the pelvis and attaches to the lesser trochanter.
  • Hip adductors
    Five muscles running from the pubis to the back of the femur in overlapping layers. They draw the thigh towards the midline and control the pelvis in single-leg stance.
  • Forearm muscles
    Masses gathered near the elbow, continued by long tendons to the wrist and fingers. They drive the hand from a distance and carry grip strength.
  • Tibialis anterior
    A muscle pressed against the outer surface of the tibia, its tendon swinging towards the inside of the foot. It lifts the toes on every step and brakes the forefoot after heel strike.
  • Diaphragm
    A muscular dome running from the lower border of the ribs, the sternum and the lumbar vertebrae to a central tendon. As it contracts it descends, the chest gains volume and air enters: it is the engine of quiet breathing, and the ceiling of the abdominal cavity.
Guided steps
  • 1/5
    The front of the body. Pectoralis major covers the upper chest, the deltoid caps the shoulder, the biceps fills the front of the arm, the abdominal wall links the ribs to the pelvis, and the quadriceps fills the front of the thigh. Further out on the limbs, the forearm muscles drive the wrist and hand, and tibialis anterior lifts the foot.
  • 2/5
    The back of the body. The trapezius links the neck to the shoulder blades, the latissimus dorsi fans down to the pelvis, the erector spinae flank the spine, and the triceps fills the back of the arm. Glutes, hamstrings and calves form the posterior chain from hip to ankle.
  • 3/5
    Beneath the visible groups work muscles no silhouette shows. The rotator cuff holds the head of the humerus against the shoulder blade, serratus anterior keeps the shoulder blade flat on the ribcage, the iliopsoas links the lumbar spine to the femur, and the adductors fill the inner thigh. Deeper still, the diaphragm closes the trunk as a dome, inside the ribs. They orient and stabilise more than they move.
  • 4/5
    In a push, force starts at the ground, travels through the quadriceps and the abdominal wall, and then pectoralis major, the anterior deltoid and the triceps drive the load away from the trunk. The skeleton acts as the lever: no group works alone, and the quality of the movement comes from their sequencing.
  • 5/5
    In a pull, the latissimus dorsi and trapezius bring the arm and shoulder blade towards the trunk while the biceps flexes the elbow. Glutes, hamstrings and erector spinae hold the pelvis and spine so that force transfers without the trunk collapsing.
Model licence · Z-Anatomy et BodyParts3D — CC-BY-SA 4.0
Rotation reads alongside the loaded carry, which asks the trunk to resist a rotation rather than produce one, and the lunge, which introduces the frontal plane. On the structural side it involves the abdominal wall, the erector spinae, the latissimus dorsi and the hip.

Sources

Main sources

  • Neumann DA (2016). Kinesiology of the Musculoskeletal System: Foundations for Rehabilitation, 3rd edition. Elsevier.
  • Standring S (2020). Gray's Anatomy: The Anatomical Basis of Clinical Practice, 42nd edition. Elsevier.
  • McGill SM (2010). Core training: evidence translating to better performance and injury prevention. Strength and Conditioning Journal.
Put it into practice in Shapier

See the russian twists exercise

Open the russian twists exercise page in Shapier, the exercise that puts trunk rotation into practice.
See the russian twists exercise
Body Lab explains; Shapier lets you act and track.

Check my understanding

Where does most of the range of a trunk rotation come from?
In a rotation to the left, which muscles drive the trunk?
Is a large rotation range the sign of a good quality of movement?
Choose an answer

Read next

  • Abdominal wall
    The abdominal wall brings together four stacked muscles whose fibres cross. It flexes and rotates the trunk, but its most constant role is to resist movement and to manage internal pressure.
    With a 3D scene
  • The lumbar spine
    Five vertebrae, five discs and a set of ligaments. Each level moves only a few degrees: it is their sum that gives the trunk its range.
    With a 3D scene
  • Loaded carry
    Walking while holding a load is nothing like an arm exercise. It is holding work, where the grip, the trunk and the pelvis must hold while the legs move.
    With a 3D scene

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Trust and method

Author
equipe-editoriale-shapier
Editorial review
Thanh Chau
Scientific review
Pending
Published on
August 2, 2026
Reviewed on August 2, 2026
Next review due August 2, 2027
Limits of this page
  • How range is shared between segments varies with the measurement method and the starting position: the orders of magnitude quoted describe a trend, not an individual value.
  • The pattern described is a controlled rotation, with no thrown load: a ballistic sport-specific movement distributes the loads differently and is not covered here.
  • This page explains a movement; it judges no execution and does not say what should be avoided.
  • Low back pain triggered by rotation belongs to a health professional, not to an explanatory page.
Sources
  • Neumann DA (2016). Kinesiology of the Musculoskeletal System: Foundations for Rehabilitation, 3rd edition. Elsevier.
  • Standring S (2020). Gray's Anatomy: The Anatomical Basis of Clinical Practice, 42nd edition. Elsevier.
  • McGill SM (2010). Core training: evidence translating to better performance and injury prevention. Strength and Conditioning Journal.
Educational content. Body Lab does not diagnose and does not replace professional advice.
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