http://www.artofliving.org/sudarshan-kriya :
As taught on the Art of Living Part 1 Course,
Sudarshan Kriya incorporates specific natural
rhythms of the breath which harmonize the
body, mind and emotions. This unique breathing
technique eliminates stress, fatigue and
negative emotions such as anger, frustration
and depression, leaving you calm yet energized,
focused & yet relaxed.