Contagious laughter is a good virus to spread, and laughter yoga has been spreading it for 20 years now.

The concept is simple: intentional, group laughter. Laughter yoga originated in India, thanks to general practitioner Madan Kataria and his wife Madhur, a yoga teacher.

Their method is a combination of laughter exercises and yogic breathing, and the laughter produced quickly becomes natural and contagious.

This technique is said to have physiological and psychological benefits, as demonstrated by a large number of scientific publications.