The purpose of this study was to investigate the effects of HT compared with McK exercise on pain and disability in patients with LBP.

Inclusion Criteria:

• Had persistent back pain at least eight weeks or during the last year subjects must suffer from LBP at least three times and each time lasted more than a week.

Exclusion Criteria:

• Had a history of fracture or surgery in the spine, pelvis and lower extremities through last year
• History of neuromuscular disease
• The referral and radicular pain in the lower extremities and neurological or sensory disturbance in the lower extremities
• Urinary incontinence and pain severity higher that 7 based on visual analogue scale (VAS)