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Thoracic extension over a chair back

How to do the Thoracic extension over a chair back correctly: it targets the Thoracic spine extensors and mobility, the hold is 5 slow reps, 10 s each, and the steps below keep it on the muscle instead of the joint.

This is mobility information, not physiotherapy and not a diagnosis. Pain is the border: a stretch that hurts at the attachment, sharpens, or sends pins and needles down the limb is loading a nerve or a tendon, not a muscle — stop and, for anything that persists or radiates, see a clinician. After an injury or surgery, stretching follows the treating clinician's protocol, not this page.

How to do it

1. Sit on a chair with a back that reaches your shoulder blades, and clasp the hands behind the head.
2. Lean back over the top edge of the backrest until the upper back arches over it — the hinge is the upper back, not the lower.
3. Hold 10 seconds, breathing out as the chest opens, then sit back up.
4. Repeat five times, trying to arch one vertebra higher each rep.

Why this stretch exists

The thoracic spine is built to extend and rotate, but desk posture locks it into flexion, and the body borrows the missing extension from the neck and the lower back — two segments that are not built for it and complain. This exercise restores the motion where it belongs. It is the highest-value move in the desk routine precisely because it is not a muscle stretch in the usual sense: it is range-of-motion work for the stiffest segment of the sitting spine.

The lower back must stay out of it — if the arch happens at the waist instead of the shoulder blades, the chair back is too low or the hinge is wrong. Any history of vertebral fractures or severe osteoporosis makes loaded back extension a clinician's decision, not a chair trick.

Hold and frequency figures: the standard stretching and range-of-motion literature — 15–60 second holds, two to four rounds per muscle (about 60 seconds total), two to three sessions a week for measurable gains, static holds after activity or as their own session, dynamic movement before. The injury-prevention position: the systematic reviews — stretching does not prevent injury or soreness; it buys range of motion and comfort. Checked 2026-09-06.

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