As I lie on a wooden floor stretched out in Savasana (Corpse Pose), my mind is calm after an hour of vigorous exercise and deep breathing. The people around me are still and the room is quiet, save for the sounds of slow, gentle inhalation and exhalation. It could be the final moments of any yoga class. But then the man next to me suddenly lets out a thunderous guffaw. Across the room, a woman giggles in response. Soon the entire room is alive with sound—chortles and chuckles, hearty laughs and howling hoots. It’s not any class. It’s Laughter Yoga.