br br Dr. Guevara br 678-223-3900 br br In this video I explain why tight hamstrings may be the cause of your low back pain. br br Since the hamstrings attach to the pelvis, tightness in this group of muscles may affect the biomechanics of the pelvis and lumbar spine. This can lead to faulty movement patterns and in turn cause low back pain. br br In this video I show you an easy stretch to relieve tension in the hamstring muscles.