Piriformis Stretch: is helpful for individuals with low back pain including sciatica. It is considered by many the best stretch that can be performed to help reduce low back pain, no matter what low back condition an individual may have. The piriformis muscle, also know as an external hip rotator, will alter gait and causes many to walk “duck footed”. Furthermore, it can cause low back pain when tight by pressuring the sciatic nerve, as this nerve on most of the population travels through the piriformis muscle.