We learned that we needed to retroverse our pelvis to make it dynamic and to do the same at cervical level to make our scapular belt dynamic too. So we have to erase these two curves to make our whole body dynamic. Those who specialized in functional rehabilitation or sportive medecine learned that they had to add to these curves the plantar and the popliteal ones which will be either zones of compensations and deformations or zones of rebalancing. They finally learned that there is a balance of the curves : each time one erases one of them, the others are accentuated. This under the influence of the posterior muscles of the body which preserves the same length whatever the form of the curves. One can conceive, from now on, the interest to lenghten this posterior muscular chain whose dynamics are developed by the anterior imbalance ( postural reflex ). It is because we do badly the erasure of the curves that we are unable to benefit from our body, creating constraints at the lumbar and cervical level and all suffering, more or less, from lumbar and cervical pains.

Have fun in looking at people for whom the pelvis retroversion instigate a significant dorsal rolling up and the obligation to hyperlordose the cervical area or , conversely, those who, to maintain the head up, let push the belly forward.

From the discovery of all the possibilities of L3, I notice that the dynamics of the inferior members could satisfy itself with a low lumbar kyphosis and that one could arrive to chin up without any effort with the only condition to have completely erased before the dorsal kyphosis from L3. This making, the two first lumbar vertebra, take part in the erasure of this kyphosis. A dynamic rachis lumbar is then characterized by a low lumbar kyphosis and a high lumbar lordosis with no participation of the abdominal muscles which are put in passive tension only during the re-erecting ( Lapierre : the premature use of the abdominal muscles in dynamics of the human body is a physiological monstrosity ).. Notice that this dynamic attitude is felt perfectly by high level sportsmen and the practise of Martial Arts. Only people's good health education will enable them to project this feeling in everyday life.