General exclusion criteria include: osteoporosis, rheumatoid arthritis (or taking any disease modifying anti-rheumatic drugs), pregnancy or suspected pregnancy, known severe spondylolisthesis, severe scoliosis, Type I diabetes mellitus, hyperparathyroidism, hyperthyroidism, inability to lie prone for at least 40 minutes, inability to tolerate back extension or spinal indentation (eg, indentations cause discomfort), inability to speak or read English (to ensure that participants understand what is happening and can reliably relay any discomfort). People currently taking muscle relaxants will also be excluded. In addition, subjects who are hypertensive, or are prone to hypertension (smokers), will be excluded from this study as will subjects who have a history of aortic aneurysm. Although hypertension and aortic aneurysm are not contraindications to lumbar bracing, we will exclude them from this trial. Finally, some persons with low or high body mass indexes may not be eligible to participate if they are unable to be fitted properly with a brace. Subjects will also be excluded if they feel they would be unable to lie prone (i.e. face-down) for up to 1 hour during spinal stiffness and RUSI testing.