Inclusion Criteria:  Written informed consent Experiencing nonspecific lower back pain Presentation to the Emergency Department (ED) of the University Hospital Basel  Exclusion Criteria:  Inpatient disposition after ED work-up  "Red Flags" at time of ED-presentation:  Major trauma in all patients Fractures leading to immobilization Severe or progressive sensory alteration or weakness Bladder or bowel dysfunction Evidence of neurological deficit on physical examination Severe chronic disease, such as metastasized cancer, palliative care Epidural steroid injections in the last 3 months Inability or contraindications to undergo the investigated intervention or to follow the study procedures, e.g. due to certain neurological disorders, language problems, psychological disorders, cognitive impairment, physical inability etc. Prior enrolment in this trial