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Seated Trunk Rotation

Draftmobility75%beginner⬤ moderate evidence

View FHIR resourceFHIR R4 ActivityDefinition — the interoperable form of this exercise

Positions & Range of Motion

Start: seated tall, hips and pelvis square facing forward, both hands placed on the opposite knee
End: upper body rotated toward one side with the pelvis staying square, eyes following the turn to add cervical rotation
Range of Motion: thoracic (with added cervical) axial rotation to comfortable end range, pelvis fixed

How to Perform

Sit tall, hands on opposite knee. Gently rotate the upper body toward that side, keeping hips and pelvis square forward. Trains thoracic rotation in a desk-compatible posture.

Watch on YouTube↗

Opens a YouTube search for “Seated Trunk Rotation”

Starting position: seated

Coaching Cues

1
Hips stay forward — only the trunk turns
(verbal)
2
Eyes follow the rotation to add cervical contribution
(verbal)

Evidence-Based Dosing & EMG Data

Recommended Dosing

5 reps each side, hold end-range 2 s.

Muscles Involved (12)

Primary Movers

External Oblique— Contralateral external oblique is a true prime mover of trunk rotation, pairing with the opposite internal oblique to turn the trunk toward the same side as the IO.

Internal Oblique— Ipsilateral internal oblique couples with the contralateral external oblique as the prime rotator of the trunk.

Secondary Movers

Rotatores (Thoracis)— Downgraded from primary: rotatores are small deep segmental muscles producing minimal rotational torque and acting largely as proprioceptive/segmental stabilizers, not prime movers. The obliques drive rotation.

Multifidus— Transversospinalis; contributes contralateral segmental rotation and spinal control.

Semispinalis Thoracis— Transversospinalis group; assists contralateral thoracic rotation.

Erector Spinae Group— Ipsilateral rotation contribution plus maintenance of the tall upright thoracic posture during the turn.

Stabilizers

Rectus Abdominis— Anterior core support maintaining the upright seated posture during rotation.

Transversus Abdominis— Deep anti-rotation bracing to keep the trunk tall and hips/pelvis square through the turn.

Quadratus Lumborum— Lumbopelvic stabilizer keeping the pelvis square while the trunk rotates above it.

Synergists & Assistors

Splenius CervicisSynergist— Ipsilateral cervical rotator engaged by the eyes-follow cervical contribution cue; minor relative to the thoracic target.

Splenius CapitisSynergist— Ipsilateral cervical rotation as the head follows the movement per the cue.

SternocleidomastoidSynergist— Contralateral cervical rotator assisting the head turn accompanying the trunk rotation.

Easier Variations ↓

Smaller Range

Half rotation until comfort builds.

Harder Variations ↑

Open Book Variation

Add arm reach overhead and behind for greater range.

Target Movements (3)

Thoracic RotationThoracic Intervertebral Joints

Cervical RotationCervical Intervertebral Joints (C2-C7)

Lumbar RotationLumbar Intervertebral Joints

Why This Exercise Matters

Everyday activities this exercise helps you do — essential means it directly trains the capacity the task needs:

Trunk Rotation & Looking Behindessential Posture Maintenance

Goals This Helps With

Rehab, performance, prevention, and mobility goals this exercise supports — essential means it's a cornerstone:

Improve Thoracic (Mid-Back) Mobilitymobility

Research Notes

Camera-friendly micro-mobility for video calls.