Spinal range of motion assessment is a standard part of the evaluation of patients with back pain. The findings of such evaluations are important in clinical decision making to ascertain the extent of impairment and also in determining compensations. Reference normative values for spinal range of motion are important to know the normal range of motion values for proper diagnosis of spine problems and as an outcome tool to measure progress during back rehabilitation. However, there is still a dearth of population-specific databases for spinal range of motion. This book presents the outcome of a study designed to assess the spinal flexibility of apparently healthy individuals using the dual inclinometer method and also to investigate the correlates of spinal flexibility.