http://www.asahi.com/english/Herald-asahi/TKY200706140056.html
Jun 14 2007 ASAHI SHIMBUN Tetsuo Kogure
article title; 'Laughter yoga' a fun way to reduce stress

my summary
Now about 200,000 people enjoy laughter yoga in many countries. Yoga has long been recognized as a route to better health and well-being. But It is a little difficult to do. However laughter yoga is easy to do and it eases mental and physical stress and activates the body's natural immune system to help ward off disease. They start laughing and clapping , then stretching their arms up into the air and inhaling deeply. It is thought laughter is the best medicine. I think this is very interesting. So I hope laughter yoga will more spread in Japan.