To grow from within, instead of straightening the back by contraction of the spinal muscles, the antigravitatory support system must be activated.
To do that for example while sitting down, the legs role in supporting the body's weight must be lessened.
Macdonalds achieved this by taking the pupil's upper body backwards from the head, before taking him forwards while at the same time rising him from the chair.
Back-back means not pushing with the chest forwards, so the back stays back of the head.
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