Sacrum (or the Sacral region), is towards the base of the spine, below the lumbar and above the tailbone (coccyx). Anatomically, these lowest regions of the spine are not credited with much movement. Both the sacrum and the tailbone are composed of vertebrae that fuse by adulthood. The sacrum gives stability to the pelvic girdle and forms part of the vertebral canal. The coccyx is regarded as vestigeal – of no particular use. But structurally, the sacrum is like the ‘keystone’ of an arch, and this unique position is of importance in spinal movement. This session looks at the fulcrum like position of the sacrum in back arches and forward extensions.  We explore if forward extensions and back arches are opposites of each other, mirrors to each other, or parts of the same continuum? Explore the beautiful relationship playing out in our body, culminating in supported and deeply restful Viparita karani in the subsequent sessions.