Lower back soreness or stiffness may be linked to tightness in the iliopsoas muscle. Targeted stretching of the iliopsoas can help relieve muscle tension and reduce discomfort.
A simple way to check for iliopsoas tightness is the Thomas Test:
- Lie flat on your back and pull one knee toward your chest. If the opposite leg—kept extended—lifts off the ground or bends at the knee, this may indicate tightness in the iliopsoas muscle.





