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.
Neutral pelvis is a position of balance the entire body uses to help keep you upright, moving and pain free. In a swayback, the pelvis is tipped forward another 10 degrees or so (40 degrees total). In addition, the whole pelvis moves in a forward direction (and your hips extend). The spine bends back sharply.