Purpose The SNPE (Self Natural Posture Exercise), developed and practiced widely in Korea uses unique tools and body correction belts to make tension release and to correct unbalanced posture. This study examined the effectiveness of SNPE on disability, range of motion (ROM), muscular strength, and pelvic pain in young women with chronic low back pain. Methods Twenty five women (27.6±6.5 yrs, 23.8±3.8 kg/m²) who had back pain for more than 3 months and scored 5-14 of the Korean Oswestry Disability Index (KODI) were divided into three groups; SNPE group (SNPEG, n=9), stretching group (SG, n=8), and non-exercise group (NG, n=8). SNPEG and SG participated in a respective 60 min exercise program twice a week for 12 weeks, while NG did not. KODI, Remodified Schober Test, Finger-to-Floor Distance Test, back strength, and VAS were measured at pre and post of 12 weeks. Statistical analysis was performed by paired t-test and ANCOVA. Results The lumbar disorder index was significantly decreased in SNPEG (pre: 7.6±2.7 vs. post: 3.1±2.7, p<0.001), and the decrease was the biggest in SNPEG than other two groups (p<0.001). Flexion of lumbar increased from 22.4±2.7 to 26.8 ± 2.9 cm (p<0.05) while extension decreased from 12.2±1.0 to 10.9±1.0 cm (p<0.05). Lateral flexion to left side was decreased from 46.8±3.9 to 42.5±2.7 cm in SNPEG and from 46.6±3.2 to 44.7±3.4 in SG (p<0.01), and lateral flexion to right side showed similar changes (p<0.01). No changes in lateral flexion to both side in NG was found. The changes in flexion, extension, and lateral flexion to left and right were the largest in SNPEG (p<0.05). Back strength increased in SNPEG from 57.5±13.4 to 72.6±12.5 kg (p<0.001), while other groups did not increase. Pelvic pain in SNPEG decreased in all 10 sites from 4.6±1.1, 3.0±1.5, 6.5±1.4, 5.8±1.6, 4.7±2.2, 5.7±1.9, 5.2±2.5, 6.3±2.1, 6.3±2.2, and 6.4±2.4 to 0.7±0.9, 1.2±1.3, 2.3±1.5, 2.2±1.6, 1.6±1.9, 2.1±1.6, 2.5±2.2, 3.1±2.4, 1.8±0.8, and 1.7±0.8 in Sacrum left and right (L-R), Iliopsoas L-R, Lateral Iliac Crest L-R, Adductor L-R, and Gluteus maximus L-R, respectively (p<0.05). Pelvic pain in SG also decreased in all sites (p<0.05) while not in NG. Conclusion The results suggest that the SNPE can be an effective exercise program for improving disability, ROM, muscular strength, and pelvic pain release in young women with low back pain.