 The purpose of this small RCT is to investigate whether this is a good research design and procedure to measure the effect on QoL, PI and the AROM in patients with NSP-CLBP. This after following an episode of 6 weeks twice a week physiotherapeutic back rehabilitation according to the 4MTOR. The results in this research will also be analysed and reported. The research design and procedure will be useful when this small RCT shows that the 4MTOR can positively influence the QoL,PI and the AROM with a p value α 0.05 in NSP-CLBP patients. 