As seen in the video below, bracing is a technique for stabilizing the spine.
Basically in bracing we tighten all the muscles surrounding the abdomen. As we contract the abdominal muscles the erector spinae muscles immediately go into joint action and support the back from the rear.
In essence, we create a natural girdle that stabilizes and protects the spine.
We also contract the pelvic floor muscles from below.
When we want to maintain maximal posture, we will inhale, which causes the diaphragm to descend and increase the rigidity of the torso.
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