Specific to the spinal function tests used here, excluded subjects will include those with suspected or confirmed malignancy as the cause for back pain, spinal fracture (current or within the last 5 years), previous non-day surgery to the abdomen, spine pelvis or hips, presence of nerve root involvement (presence of at least 2 of the 3: myotomal weakness, altered sensation in dermatomal patterns, and/or altered knee/ankle reflexes), ankylosing spondylitis and current skin conditions that may be aggravated by bracing, These exclusion criteria relate to back conditions for which spinal function testing is contraindicated (eg, malignancy) or in which there is a greater chance of causing discomfort (eg, nerve root involvement).