Lion's breath is performed by starting in simhasana then lowering the jaw to open the mouth wide, stretching the tongue out and curling it down. The gaze is toward the sky. The muscles at the front of the throat contract and a forceful exhalation is made with a roaring "haaaa" sound, feeling the air pass over the back of the throat. This can be repeated two or three times.
Lion's breath is said to provide an ideal outlet for negative energy. The powerful exhalation and the engagement of the arms and shoulders are a manifestation of the release of negative energy from inside. It is said that many problems are a result of anger and resentment held inside and lion's breath, with simhasana, releases that energy. It is important that the exhalation is strong and full of intention, not half-hearted, in order to experience the full benefits.
Lion's breath stimulates the manipura chakra, and may also improve self-esteem and feelings of empowerment.