The other name is fixed kyphosis. Slouch. The reason is mesenchimal tissue. Somebody has loose mesenchimal tissue, and others have tough mesenchimal tissue. If you have tough mesenchimal tissue, your back will be stooped. You then need hirudotherapy, physical training and osteopatic or manual techniques. Or may be massage of special kind. You need redressation of anterior longitudinal ligament of the spine. And posture corrector.
HIRUDOTHERAPY
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