The assessment for the mobility in the lumbar spine is the well-known dog tilt. It will require the comparison between students so its a subjective assessment. A student doing the back bend to her own personal edge will feel as if its very bendy and curvy, so only a comparison will show the difference between stable and mobile. A student with the stable spine will understand the need for more support on some poses and will have greater acceptance why some postures are just not possible.
