We cannot equate this with a purely biological freedom or vitality, or spontaneity. Bergson and His Philosophy J. Alexander Gunn. It is a more serious difficulty that Paul knows of no Longobardic king with a name which we can equate with Sceaf.
But this posture makes your pelvis rock forward into an anterior pelvic tilt, which consequently creates an increased lumbar curve (lordosis). Unfortunately, other tissues such as the muscles described above adapt to this posture over time, which contributes to back pain and injury.
In the case of flat low back posture, the bottom of the pelvis is brought towards the back of the thigh resulting in extra tightening in that muscle. The chronically tense hamstring contributes to the backward tilt of the pelvis which, as we've discussed, contributes to the flattening out of the normal low back curve.