The variable geometry
The Postural Bench is geared with  two reclining plane ( head and trunk plane A, inferior arts plane B) with the pelvis like a fulcrum.
Both the plane can be reclining in a independent way with a step of 15 degrees. It’s  deducible as “close” more the system, the behind muscles  structure contract oneself and it stress the rotation and the muscles  asymmetry.
The system gets automatically the inclination  of the two plane through the electronic.  The registered data can be take again subsequently to set the system in the same configuration.