You've heard of Hatha Yoga and Hot Yoga, now -- no joke -- there's Laughter Yoga, The Herald-Sun in Durham, N.C., reported. During a three-day workshop at Patanjali's Place yoga center in Durham, participants pretended to be laughing in an elevator, then laughing with friends, then whooping it up over imaginary tea and wine, the paper said. "I had so much energy," participant Hope Gregory told the newspaper. "It was joyful energy." Laughter Yoga was started by Madan Kataria, a doctor from Mumbai, India, and combines laughter, improvisation and yogic breathing, the Herald-Sun reported. Instructor Susan Ludwig told the paper, "Even if we ... fake laughter, just the act releases endorphins."