From the brain, the nerves that control them exit through a large number of spinal vertebrae — from the 5th to the 12th thoracic area. (philmaffetone.com)
Instead, by pulling the shoulders back and extending the thoracic area, it helps keep you in a safe posture, protecting the lower back. (onnit.com)
This involves pulling the shoulders back and extending the thoracic area of the spine slightly. (onnit.com)