Thoracic Extension Mobility (Open Book)
Improves rotational and extension mobility in the mid-back (thoracic spine), which commonly stiffens with prolonged sitting and can indirectly increase strain on the neck and lower back.
Duration
5 minutes
Calories
8-12 kcal
Reps × Sets
8-10 reps each side × 2 sets
Rest
30-45 seconds between sets
Benefits
Muscles Involved
Thoracic paraspinals, Rhomboids, Posterior rotator cuff, Obliques
Equipment Required
Exercise Mat
Step-by-Step Instructions
- 1Lie on your side with your knees bent and stacked, arms extended forward at shoulder height, palms together.
- 2Keeping your knees stacked and still, slowly open your top arm up and across, rotating your chest toward the ceiling, following your hand with your eyes.
- 3Go as far as comfortable, then slowly return to the starting position.
- 4Repeat on the same side for all reps, then switch sides.
Breathing: Exhale as you rotate open, inhale as you return to the starting position.
Common Mistakes
- Letting the knees separate or roll, which lets the lower back rotate instead of the thoracic spine
- Rushing the movement instead of moving slowly and with control
Safety Tips
- Keep the rotation coming from the mid-back, not by pushing through pain
- A pillow under the head can improve comfort for the neck during the movement
Contraindications — Do Not Do This Exercise If
- Acute rib fracture
- Recent thoracic or chest surgery, before surgeon clearance
- Severe osteoporosis with high fracture risk, without clinician guidance on safe range
Stop Immediately If
- Sharp chest or rib pain
- New numbness or tingling in the arms
- Significant shortness of breath
Progressions
Harder (Progression)
Perform in a tall kneeling position for a greater range of motion challenge, or add a very light dumbbell in the moving hand.
Easier (Regression)
Reduce the rotation range, or perform seated with a smaller, more controlled motion.
Scientific Evidence
Thoracic mobility exercises are commonly recommended in physical therapy for addressing compensatory strain patterns; while high-quality randomized evidence specifically isolating thoracic mobility drills is limited, they are widely supported in clinical practice guidelines for postural-related upper back and neck complaints.²
I recommend this to almost every patient with a desk job, regardless of whether their primary complaint is neck or lower back pain — thoracic stiffness quietly contributes to both. — Dr. Vishal Nigam
Frequently Asked Questions
Related Exercises
References
- 1. North American Spine Society Section on Interdisciplinary Spine. Therapeutic exercise following lumbar spine surgery: a narrative review.
- 2. American College of Obstetricians and Gynecologists. Committee Opinion No. 804: Physical Activity and Exercise During Pregnancy and the Postpartum Period.
- 3. American Physical Therapy Association. Clinical Practice Guidelines: Neck Pain (2017); Patient Education: Core Strengthening for Spine Health; Shoulder Impingement and Postural Exercise.
- 4. American Academy of Orthopaedic Surgeons. Clinical Practice Guideline: Management of Osteoarthritis of the Knee; OrthoInfo: Thoracic Spine Conditions, Hip Impingement.
- 5. World Health Organization. 2020 Guidelines on Physical Activity and Sedentary Behaviour.
- 6. American College of Sports Medicine. Position Stand: Resistance Training Prescription for Muscle Function, Hypertrophy, and Physical Performance in Healthy Adults (2026); Guidelines for Exercise Testing and Prescription — Flexibility Recommendations.
- 7. North American Spine Society. Patient Education: Understanding Sciatica; Diagnosis and Treatment of Degenerative Lumbar Spinal Stenosis.
- 8. World Health Organization. 2020 Guidelines on Physical Activity and Sedentary Behaviour — Older Adult Recommendations.
- 9. Carenyx Knowledge Library. Understanding Slip Disc (01-understanding-slip-disc.md); Understanding Sciatica (02-sciatica.md) — reused directly, not re-derived.