"Laughter yoga" may be silly, but according to this study, it's a serious ab workout.

They say that laughter is the best medicine. And these days, who wouldn't benefit from a good laugh? Well, according to this study, your abs also benefit from laughing, even if that laughter is gotten by seemingly artificial means: laughter yoga. Honestly, if this youtube video is at all representative of a laughter yoga session, it looks pretty awesome. And it's even a better ab workout than traditional crunches. WIN! [embed]http://www.youtube.com/watch?v=lGNOF8DVIPQ[/embed] Laughing: a demanding exercise for trunk muscles. "Social, psychological, and physiological studies have provided evidence indicating that laughter imposes an increased demand on trunk muscles. It was the aim of this study to quantify the activation of trunk muscles during laughter yoga in comparison with crunch and back lifting exercises regarding the mean trunk muscle activity. Muscular activity during laughter yoga exercises was measured by surface electromyography of 5 trunk muscles. The activation level of internal oblique muscle during ...