Jason Redmond / Star staff Ventura 8/14/07: Robert Chavez, onsite coordinator of the Adult Wellness and Recovery Center, left, and Chris Davidson of Ventura participate in a laughter exercise during "laughter yogaÓ at the center on Tuesday. Certified laughter group leader Grace Sweet says that because the mind doesn´t know the difference between real and fake laughter, one can take advantage of its many benefits, such as stress relief, serotonin production, and the release of endorphins.