iliopsoas stretch
This exercise is essentially a standing lunge with a pelvic tilt. Begin from a standing position. Step forward with on leg, placing one foot in front of the other. Keep both legs slightly bent. Weight should be distributed toward the front foot. Flatten the back and tuck the hips under, stretching the iliopsoas muscle on the front of the back leg. For added stretch, either lean slightly back with the upper torso or bend further at the knees
Muscle-iliopsoas