Tight hip flexors and hamstrings affect the lumbar spine. When there is an imbalance in these muscles, the low back is prone to strain and injury.
A chronic state of shortening of the group muscles that make up the hip flexors can lead to an increased anterior pelvic tilt, and when the hamstrings are too tight, the pelvis is unable to tilt properly. The body as a result has to compensate for this lack of flexibility, leading to strain.
Additionally, over time, these shortened and weak muscles are unable to perform their jobs efficiently, leading to tension and fatigue on the low back and pelvis.
Here is a stretch that will effectively stretch both the hip flexors and hamstrings at the same time, and lead to decreased low back pain.
Dr. Amanda Lett, BSc(Hons), DC