When we tuck our tail or pull up our abdomen to manipulate ourselves into the form of table, we suppress our gonadal energy (energetic flow through the gonads).
When there is a problem in an upper or lower limb, going back to their embryological origins can be helpful to recalibrate the length and cellular organization of the limb.
A common instruction in yoga, material arts, dance, and other types of movement practices, as well as in rehabilitation therapy modalities is to tuck the tail (coccygeal vertebrae).