Transcranial Direct Current Stimulation (tDCS) Combined With Aerobic Exercise in Chronic Nonspecific Low Back Pain (LBP)

Inclusion Criteria: * Diagnosis of non-specific Low Back Pain for at least 3 months based on careful radiological evaluation and clinical diagnosis by a physician. * Aged from 18 till 65 years old. * Scoring higher than 20mm on the 100 mm VAS scale * Scoring higher than 4 on the Rolland-Morris scale Exclusion Criteria: Any subject presenting at least one of the following exclusion criteria will be excluded from the study: * Vertebral fractures, osteoporosis * Infections * Lumbar surgical, herniated disc or nerve root compression * Rheumatologic diseases * People with central nervous system alterations * Structured deformities of the spine (scoliosis) * Oncology patients in active treatment or within 5 years after the end of the treatment * Fibromyalgia * Women who are pregnant or who may be pregnant * Contraindications to tDCS (epilepsy, cranial implanted devices, neurological o psychiatric disorders, sever cardiopulmonary, renal or hepatic disorders) * Being under physiotherapeutic or osteopathic treatment during the study period * Absolute contraindications to aerobic exercise (acute myocardial infarction, unstable angina pectoris, uncontrolled arrhythmia, heart failure, acute pulmonary embolism, myocarditis or acute pericarditis) * People who need walking assistance (cane, other person to assist) * Patients who practise regular physical activity defined as leisure-time physical activity for 30 minutes, three or more times per week * People unable to give informed consent, or unable to complete the selected questionnaires.