IRCT20250113064372N1 IRCT 2025-02-24 Sistan and Baluchestan University of Medical Sciences Hamstring stretching exercises and core stability exercises in back pain The effect of adding hamstring stretching exercises to core stability exercises on pain, range of motion, sense of position, fear of movement and function of pre-elderly women with non-specific chronic back pain 2025-02-28 anticipated 30 Complete https://irct.ir/trial/81726 interventional Randomization: Randomized, Blinding: Single blinded, Placebo: Not used, Assignment: Parallel, Purpose: Treatment, Randomization description: Through a drawing a piece of paper and in the presence of the people themselves, each person will be given a number from 1 to 30. The numbers will be written on paper, folded and placed in a container (container number 1). Then, in another container, the names of the groups (15 sheets per group) will be folded and placed inside the container (container number 2). Then, the "drawing a piece of paper" process will be done in the presence of the participants. One person will draw the number and group and one person will do this to record and write the numbers. All people will be grouped in the same way, Blinding description: Participants participate in the study with the assumption that they will receive a similar exercise. N/A Chronic non-specific low back pain. Intervention 1: Intervention group: core stability exercises and hamstring stretching exercises to increase the flexibility of this muscle. Exercises will be performed three times a week for 8 weeks. Intervention 2: Control group: core stability exercises ,three times a week for 8 weeks. Undecided - It is not yet known if there will be a plan to make this available Justification or reason for indecision in sharing IPD is no more information