In this picture taken on Thursday, June 19, 2014, a group of Iranian women practice in an outdoor session of their Laughter Yoga class in the Darakeh mountainous area north of Tehran, Iran. The course in Tehran helps people from various age groups and social backgrounds to have fun and take a break from stressful daily lives. Laughter Yoga was started in India in 1995 by medical doctor Madan Kataria, in response to a body of scientific research which shows that laughter is extremely good for physical, emotional and mental wellbeing. (AP Photo/Vahid Salemi)