The bones on both sides of the pelvis where you feel your body weight when you sit, often referred to as the “sit bones,” are technically called the “ischial tuberosities.”
They are weight-bearing parts of the pelvic girdle in a sitting position. If the pelvis becomes distorted, or out of alignment, the distribution of your body weight on these bones when sitting will be skewed, or uneven.
Sitting will be uncomfortable, as may other activities as well---walking, sleeping, etc.
This is correctable with precise, directional, adjustments with the Activator adjusting instrument. As an Advanced Proficiency Rated ACTIVATOR Chiropractor, I correct this when I balance the pelvis, without pain or discomfort to the patient.