Among the "secret" aspects of Yoga are the Bandhas, which may be translated roughly as breathing exercises. After the body has been prepared by thorough practice in the different asanas and clarified by the breathing exercises, the Yogi is ready for the Bandhas. These may not be attained immediately since they depend on a full state of body and mental relaxation for successful attainment.
By a very strong expiration, the lungs are emptied and .
In the Vedic and Upanishad periods of Yoga, total abstinence from sexual intercourse (brahmacharya), whether by action, mind or word was considered to be one of the highest virtues leading to Yoga.
Later exponents of Yoga, however, interpreted the injunction toward a continent life to mean that one should maintain a dispassionate attitude toward sexual matters and that there should be purity in sex.
Some of the earlier Yogins stated that Yoga is mainly for .