Sudarshan Kriya (SK) is a rhythmic breathing practice originating from the Art of Living tradition, claimed to produce physiological and psychological benefits. A commonly taught variant uses a cycle pattern often described as "20–40–40" corresponding to counts or durations within guided audio sessions. This paper reviews the practice and structure of the 20–40–40 audio format, proposed mechanisms of action, current empirical evidence, methodological limitations, safety and ethical considerations, and directions for future research.
This entire sequence is typically repeated for , lasting between 7 to 10 minutes. The process is designed to harmonize the body's natural rhythms with the breath, flushing out deep-seated stress and toxins at a cellular level. The Role of Audio in Practice
, which may provide versions for graduates of the Happiness Program.
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