Our hips are one of the most mobile joints of the body thanks to their 'ball and socket' design. One of the primary movements of the hips is rotation. External (or lateral) rotation is facilitated by numerous muscles including the Piriformis muscle. This muscle has an interesting anatomical setup that requires some playful and purposeful isolation into order to functionally target it when stretching.
We are very familiar with the general concept of yoga being about 'balance' and 'harmony' for the physical, mental, and energetic body. These relationships of balance cross their respective boundaries influencing each other. In terms of the physical body, it is essential that we respect the musculoskeletal relationship of balanced muscle tension.