Shoulder Stand (sarvangasana) stimulated the endocrine system and balanced the nervous system. In hatha and some other yoga systems, head stand (sirsasana) is called the king, and shoulder stand (sarvangasana) is called the queen. Just as a country cannot thrive without a strong and effective king (or head of state), a person cannot thrive without a strong and healthy brain. As for sarvangasana, regular practice of it is thought to create harmony in the nervous and endocrine systems, just as a mother creates harmony in the home and the queen creates harmony in her country. While shoulder stand (sarvangasana) can be practiced by itself, head stand (sirsasana) should always be practiced together with sarvangasana.