Introduction: Lower back pain is defined as the presence of pain, with or without stiffness, located in the lower region of the spine, between the last costal arch and the gluteal fold. In the elderly, inherent factors of aging, such as inactivity, postural instability and a decrease in neuromuscular response, contribute to its occurrence. Although studies have pointed to a reduction in prevalence in this population, when the severe forms of lower back pain are analyzed, there is a significant increase. Objectives: The aim of this study was to evaluate the effect of the Isostretching method on the pain and flexibility of the lumbar spine in the elderly. Methods: The sample was composed of 14 women with lower back pain and a mean age of 70 years. 24 isostretching sessions were performed and assessed regarding the pain and flexibility of the lumbar spine. The elderly were evaluated before the start and after the 12th and 24th session, through a specific evaluation that included data from anamnesis, history, a specific test (Schober), goniometry of the lumbar spine, and the Visual Analogue Scale (VAS). Results: The results reveal that there was a reduction in the sensation of pain and a gain in flexibility after the isostretching sessions. Conclusions: It was concluded that the method the method was effective in the improvement of the variables under study.