Breathe. Laugh. Be Happy. The Science Behind Laughter Yoga.

(CNN) — The cackles can be heard from far beyond the brick walls of the private garden playing host to a Laughter Yoga Atlanta session.
On a bright weekend morning, at the height of the steamy Georgia summer, a group of about 40 students is visibly invigorated.
At intervals they chant or clap, frolicking in a large open circle while purposely seeking eye-contact with the nearest person — most likely someone they just met.
Welcome to laughter yoga.
The practice, designed by Indian doc