Thoracic Extension: A Seated Move for Mid-Back Mobility
Movement card
| Body area | Upper back |
|---|---|
| Also called | thoracic extension exercise, thoracic extension, upper back arch |
| Works | upper back, mid back, thoracic spine, chest |
| Type | Mobility |
| Position | Seated |
| Hold | 2 to 5 seconds |
| Reps | 5 to 10 |
| Sets | 1 |
| Sides | Not applicable |
| How often | Perform a set a few times throughout the day, especially when feeling stiff. |
| Equipment | Chair |
| Office visibility | Medium |
The seated thoracic extension is a mobility movement that involves arching your upper back over the back of a chair. It is also called an upper back arch.
This exercise is often used by people who feel stiff from slouching over a keyboard for long periods and want to move their spine in the opposite direction.
What the seated thoracic extension works
This movement targets the thoracic spine, which is the upper and mid-back region. It also creates a stretch across the muscles of the chest.
How to do it
Starting position: Sit tall toward the front of your chair with your feet flat on the floor. Place your hands behind your head with fingers interlocked and elbows pointing out to the sides.
- Breathe in and gently lean back over the top of your chair.
- Allow your upper and mid back to arch, keeping your lower back stable.
- Lift your chest and gaze toward the ceiling without straining your neck.
- Hold the position briefly.
- Breathe out and slowly return to the upright starting position.
What you should feel
You should feel a gentle stretch in your upper back and across your chest. The movement should not feel sharp or painful. Avoid arching your lower back or forcing your neck forward with your hands.
Common mistakes
- Arching the lower back instead of the upper back.
- Forcing the neck forward with your hands.
- Holding your breath.
- Moving too quickly into the arch.
Make it easier or harder
- Easier: Cross your arms over your chest instead of putting your hands behind your head.
- Easier: Reduce the range of motion; only lean back as far as is comfortable.
- Easier: Use a chair with a lower back.
- Harder: Use a chair where the backrest ends just below your shoulder blades to better isolate the movement.
- Harder: Place a small rolled towel horizontally across your upper back between you and the chair.
Fitting it into a desk day
This exercise helps counteract the effects of slouching and can be done in most office chairs. With medium visibility, it is suitable for a brief pause between tasks or during a phone call when your camera is off.
Quick questions
How long should I hold a thoracic extension?
Hold the stretched position briefly, for about two to five seconds, before returning to the start.
What if putting my hands behind my head is uncomfortable?
For an easier version, you can cross your arms over your chest instead of placing your hands behind your head.
How many repetitions of this exercise should I do?
You can perform a set of five to ten repetitions a few times throughout the day, especially when you feel stiff.
When to see a doctor or physio
Certain symptoms are a sign to stop this movement. If you experience any of them, it is best to get checked by a doctor or physical therapist before continuing.
- Sharp, shooting, or radiating pain.
- Numbness or tingling in your arms or hands.
- Dizziness or lightheadedness.
Skip it or ask first if:
- You have a recent injury to your back, ribs, or shoulders.
- You have a diagnosed spinal condition like severe osteoporosis or a disc herniation.
- You have had recent surgery on your back or abdomen.
How this page was put together: general guidance consistent with public workstation and movement-break resources from OSHA, CDC/NIOSH and the NHS, and with standard exercise handouts. It was drafted with AI assistance, checked in a separate review pass and edited under our editorial policy. It is not medical advice and no clinician reviewed it. Last checked October 2026.