Final answer:
During sacral sitting, the lumbar spine is in a neutral or slightly flexed position to support the lower back.
Step-by-step explanation:
The lumbar spine is in a neutral or slightly flexed position during sacral sitting. Sacral sitting refers to a sitting position where weight is distributed on the ischial tuberosities, or the bony prominences of the pelvis, rather than on the sacrum. In this position, the lumbar spine maintains its normal slight curve, which helps to support the structures of the lower back.