Inclusion Criteria:  Older people aged 60 years old or over who have nonspecific LBP, defined as pain below the costal margin and above the lower gluteal folds, with or without referred leg pain for at least 3 months. Disability with score 4/24 in Roland-Morris Disability Questionnaire or higher and persistent back pain of pain 3/10 or higher.  Exclusion Criteria:  Suspected or confirmed serious spinal pathology (fracture, metastatic, inflammatory or infective diseases of the spine, cauda equina syndrome/widespread neurological disorder); Radiculopathy (i.e. presence of 2 of the 3 following criteria: strength, reflex or sensation alterations compatible with lumbosacral nerve root compression); Previous history of spinal surgery; scheduled for major surgery during the study or at the follow up period; Any of the contraindications to exercise listed on page 103 of the American College of Sports Medicine (ACSM) guidelines.