I had just moved across the country, was teaching a ridiculous amount of yoga classes, and charging up and down the hills of San Francisco like a mad woman (not wearing proper footwear to boot). Later I discovered that all of these conditions definitely could have contributed to the tightening and overuse of my piriformis, resulting in the constant pain pulsating down the back of my left leg. In Yoga Tune Up® there are several different methods that can be used to help prevent or keep this condition at bay.