Use your hands to slide the skin of your buttocks and sacrum toward the wall as though you were smoothing out and lengthening your lower back. (yogajournal.com)
Roll back until you connect the tailbone or sacrum with ground (roll to the place you find stable and secure). (christinebullock.com)
• Keep hands at sacrum, core engaged, heart lifted, chin to chest, and spine long as you exhale and extend into a backbend. (johnscreekyoga.com)