Efficacy of Educating Physical Therapists in the Treatment of Patients With Nonspecific Chronic Low Back Pain

Inclusion Criteria: * patients seeking care for chronic non-specific low back pain (defined as pain or discomfort between the costal margins and the inferior gluteal folds, with or without referred symptoms in the lower limbs, for at least 3 months), with a pain intensity of at least 3 points measured by a 0-10 pain numerical rating scale, aged between 18 and 65 years. * physiotherapists who treat exclusively patients with musculoskeletal pain, duly accredited by the National Council of Physical Therapy, physiotherapists offering private or medical insurance treatment individually to their patients, lasting 50-60 minutes each session, physiotherapists from 2 to five years of graduation and / or working in the area for the same period, that treat at least 2 patients with low back pain per month, and who are willing to treat at least 10 patients for the study. Exclusion Criteria: * patients will be excluded if they have any contraindication to physical exercise or ultrasound or short wave therapy, evidence of nerve root compromise (i.e one or more of motor, reflex or sensation deficit), serious spinal pathology (such as fracture, tumor, inflammatory and infectious diseases), serious cardiovascular and metabolic diseases, previous back surgery and pregnancy. * physiotherapists who want to stop the activities for some reason that prevents participation in the study