The recommended posture for thoracic rotation measurement includes standing with the back as near to parallel to the floor and knees straight without being locked out.

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Measuring thoracic rotation effectively hinges on isolating the movement to the thoracic spine and keeping the rest of the body stable. Standing with the back nearly parallel to the floor helps reduce lumbar movement and pelvic tilting, so the rotation you observe largely comes from the thoracic region. Keeping the knees straight but not locked avoids locking the joints and keeps a stable base, preventing compensations from the lower body that could skew the measurement. This combination provides a consistent, repeatable posture that targets thoracic rotation and minimizes contributions from other areas, which is why this stance is recommended.