Personalized Physical Back Training Program to Improve Physical Functioning in People with Non-specific Low Back Pain: a Feasibility Study

The aim of our clinical trial (2024-01285) is to determine how an individualized physical back training program affects physical functioning and back pain. The results will help identify the most effective treatments for low back pain. This feasibility study (2024-01284) aims to conduct a test run of the clinical trial. The main questions are: * Do all procedures run smoothly? * Does the back training program improve physical functioning? * Does the back training program reduce back pain? Participants will: * Follow a back training program for 4 weeks. * Attend group exercise sessions (30 minutes per week) * Perform exercises at home (3x10 minutes per week). * Fill out a daily questionnaire on pain and exercise adherence.