Part II Improving mobility of the lower body is also important in controlling back pain.
Tightness
in large muscles in the lower body are also very frequent causes of in low back
pain. The most common culprits are the hamstrings (back of your thigh) and the hip
flexor, a deep muscle in the front of your hip that attaches to the low back .
The hip flexor can causes increased curve in the low back and pulls your pelvis forward if it is tight.
The hamstrings often cause a flattening of the curve in the low back and tilt
the pelvis backwards when it is tight. This creates abnormal stresses upon the
spine.