The overall objective of this study was (1) to determine whether hip muscle stretching intervention in conjunction with CSE would result in greater improvements in outcomes than sham treatment, and (2) to compare commonly used hip muscle strengthening exercises. We hypothesized that the addition of hip muscle stretching exercises would show improved outcomes for both physical function and activity after 6 weeks of intervention. We observed greater differences in the pain intensity, lower back instability, hip muscle flexibility, disability level, balance ability, and QOL scores after 6 weeks for the Stretch group than the Sham group. While for the Strengthen group, we observed greater differences in lower back instability and hip muscle flexibility than in the Sham group. To the best of our knowledge, this is the first randomized controlled trial to assess the effects of hip muscle stretching exercises on patients with NSLBP