If the shaking is strong it is an indicator that the large muscles in the body are breaking up ‘iceberg-like’ tension in the muscles. These tension blockages create strong shaking until they break up and the energy can flow more easily. Finer movements are equally important in reworking our tension holding patterns. Beware of making judgments about the intensity of your shaking and what this all means.
This process will ebb and flow with varying intensity and you need to trust the body is doing exactly what it needs to in order to release held tension.