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  7. Seated Alternate Thoracic Rotation On A Chair

Exercise guide

Seated Alternate Thoracic Rotation On A Chair

  • Beginner
  • Compound
  • Rep-based
  • Back
  • Shoulders
  • Waist

This mobility exercise enhances thoracic spine rotation and core stability, specifically targeting the obliques and upper back to improve posture and spinal health. By sitting, you lock the pelvis in place, ensuring the rotation comes from the mid-back rather than the lower back.

Reviewed by the Crucible Fit team · Updated June 2026

Watch the Seated Alternate Thoracic Rotation On A Chair demonstrationVideo and instructions for every movement are in the Crucible Fit app.

Muscles worked

Primary

  • Erector spinae
  • Obliques
  • Rhomboids
  • Trapezius

Secondary

  • Abs
  • Serratus anterior

Equipment

  • Body weight

Setup

  1. Sit tall on the edge of a stable chair with your feet flat on the floor and knees hip-width apart.
  2. Place your fingertips lightly behind your ears with elbows wide, or cross your arms over your chest.
  3. Pull your shoulder blades down and back while engaging your core to stabilize your lower body.

How to do it

  1. Exhale as you slowly rotate your torso to one side, keeping your hips and knees perfectly still.
  2. Pause for a moment at the end of your comfortable range of motion to feel the contraction in your obliques and rhomboids.
  3. Inhale as you return to the starting center position with control.
  4. Repeat the movement on the opposite side, alternating back and forth in a smooth, rhythmic tempo.

Form checklist

  • Keep your weight evenly distributed on both sit-bones; do not let one hip lift off the chair.
  • Ensure the rotation happens in the upper and mid-back, not the lower back.
  • Keep your chin tucked slightly and your head moving in line with your chest.
  • Avoid pulling on your head or neck with your hands; let the core drive the movement.

Pro tips

  • Visualize your spine as a spiral staircase, rotating one vertebra at a time from the bottom up.
  • Actively pull the trailing shoulder further back at the end of the range to maximize engagement of the trapezius and rhomboids.

Make it harder

  • Extend your arms straight out to the sides in a 'T' position to increase the rotational leverage and demand on the deltoids.
  • Hold a light medicine ball or weight plate at chest height to add resistance to the obliques.

Frequently asked

What muscles does the seated alternate thoracic rotation on a chair work?
The seated alternate thoracic rotation on a chair primarily targets the erector spinae, obliques, rhomboids, and trapezius, and also works the abs and serratus anterior as secondary muscles.
What equipment do you need for the seated alternate thoracic rotation on a chair?
The seated alternate thoracic rotation on a chair requires no equipment — just your body weight.
Is the seated alternate thoracic rotation on a chair good for beginners?
Yes. The seated alternate thoracic rotation on a chair is a beginner-friendly movement and a strong foundation to build on.

Related exercises

  • Kneeling Thoracic RotationIntermediate · erector spinae, lats, obliques, rhomboids, and trapezius
  • Kneeling Upper Back Rotation Shoulder TouchBeginner · erector spinae, obliques, rhomboids, and trapezius
  • Kettlebell Overhead CarryIntermediate · abs, deltoids, erector spinae, obliques, and trapezius
  • Kneeling Back RotationBeginner · lats, obliques, rhomboids, and trapezius

Train it with Crucible Fit.

Every movement in this library is in the app with video and instructions, ready for your own sessions on the days between Crucibles. Your first Crucible is on us.

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