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https://airpgshop.it/index.php/2015/11/02/influence-of-hamstring-tightness-in-pelvic-lumbar-and-trunk-range-of-motion-in-low-back-pain-and-asymptomatic-volunteers-during-forward-bending/
Influence of Hamstring Tightness in Pelvic, Lumbar and Trunk Range of Motion in Low Back Pain and Asymptomatic Volunteers during Forward Bending