Ltpgtthe 66fit pressure bio feedback unit proves invaluable in the re education of lumbar and cervical stabilityltpgtltpgtltstronggtfeaturesltstronggtltpgtltulgtltligtthe unit comes fully assembled complete with a storage case and instructions on useltligtltulgtltpgtltstronggtdescriptionltstronggtltpgtltpgtused by dr chris norris author of seven books on physiotherapy and exercise including a textbook on sport injuries the