Laughter yoga (Hasyayoga) is a practice involving prolonged voluntary laughter. Laughter yoga is based on the belief that voluntary laughter provides the same physiological and psychological benefits as spontaneous laughter. Laughter yoga is done in groups, with eye contact, jokes and playfulness between participants.
The concept of Laughter Yoga is based on a scientific fact that the body cannot differentiate between fake and real laughter. One gets the same physiological and psychological benefits. Clinical research has proved that Laughter lowers the level of stress hormones (epinephrine, cortisol, etc) in the blood.