Participants take part in a mass yoga class to mark the summer solstice on Times Square in New York, June 20, 2012. Thousands of yogis gathered on Times Square to celebrate the longest day of the year during the event which features four free mass yoga session at the heart of Manhattan. AFP PHOTO/Emmanuel Dunand

Participants take part in a mass yoga class to mark the summer solstice on Times Square in New York, June 20, 2012. Thousands of yogis gathered on Times Square to celebrate the longest day of the year during the event which features four free mass yoga session at the heart of Manhattan. AFP PHOTO/Emmanuel Dunand

Participants take part in a mass yoga class to mark the summer solstice on Times Square in New York, June 20, 2012. Thousands of yogis gathered on Times Square to celebrate the longest day of the year during the event which features four free mass yoga session at the heart of Manhattan. AFP PHOTO/Emmanuel Dunand

Participants take part in a mass yoga class to mark the summer solstice on Times Square in New York, June 20, 2012. Thousands of yogis gathered on Times Square to celebrate the longest day of the year during the event which features four free mass yoga session at the heart of Manhattan. AFP PHOTO/Emmanuel Dunand

Participants take part in a mass yoga class to mark the summer solstice on Times Square in New York, June 20, 2012. Thousands of yogis gathered on Times Square to celebrate the longest day of the year during the event which features four free mass yoga session at the heart of Manhattan. AFP PHOTO/Emmanuel Dunand

Participants take part in a mass yoga class to mark the summer solstice on Times Square in New York, June 20, 2012. Thousands of yogis gathered on Times Square to celebrate the longest day of the year during the event which features four free mass yoga session at the heart of Manhattan. AFP PHOTO/Emmanuel Dunand

Participants take part in a mass yoga class to mark the summer solstice on Times Square in New York, June 20, 2012. Thousands of yogis gathered on Times Square to celebrate the longest day of the year during the event which features four free mass yoga session at the heart of Manhattan. AFP PHOTO/Emmanuel Dunand

Participants take part in a mass yoga class to mark the summer solstice on Times Square in New York, June 20, 2012. Thousands of yogis gathered on Times Square to celebrate the longest day of the year during the event which features four free mass yoga session at the heart of Manhattan. AFP PHOTO/Emmanuel Dunand

Participants take part in a mass yoga class to mark the summer solstice on Times Square in New York, June 20, 2012. Thousands of yogis gathered on Times Square to celebrate the longest day of the year during the event which features four free mass yoga session at the heart of Manhattan. AFP PHOTO/Emmanuel Dunand

Participants take part in a mass yoga class to mark the summer solstice on Times Square in New York, June 20, 2012. Thousands of yogis gathered on Times Square to celebrate the longest day of the year during the event which features four free mass yoga session at the heart of Manhattan. AFP PHOTO/Emmanuel Dunand

Participants take part in a mass yoga class to mark the summer solstice on Times Square in New York, June 20, 2012. Thousands of yogis gathered on Times Square to celebrate the longest day of the year during the event which features four free mass yoga session at the heart of Manhattan. AFP PHOTO/Emmanuel Dunand

Participants take part in a mass yoga class to mark the summer solstice on Times Square in New York, June 20, 2012. Thousands of yogis gathered on Times Square to celebrate the longest day of the year during the event which features four free mass yoga session at the heart of Manhattan. AFP PHOTO/Emmanuel Dunand

Participants take part in a mass yoga class to mark the summer solstice on Times Square in New York, June 20, 2012. Thousands of yogis gathered on Times Square to celebrate the longest day of the year during the event which features four free mass yoga session at the heart of Manhattan. AFP PHOTO/Emmanuel Dunand

Participants take part in a mass yoga class to mark the summer solstice on Times Square in New York, June 20, 2012. Thousands of yogis gathered on Times Square to celebrate the longest day of the year during the event which features four free mass yoga session at the heart of Manhattan. AFP PHOTO/Emmanuel Dunand

Yoga practitioners salute the sun while celebrating the solstice in New York's Times Square, Tuesday, June 21, 2011. (AP Photo/Richard Drew)

** COMMERCIAL IMAGE ** In this photograph taken by AP Images for Febreze - Thousands of yoga enthusiasts 'breathe happy' at the lucy Summer Solstice event presented by Febreze in the middle of New York's Times Square to find tranquility on the longest day of the year, Tuesday, June 21, 2011. (Diane Bondareff/AP Images for Febreze)

(100621) -- NEW YORK, June 21, 2010 (Xinhua) -- Yoga enthusiasts practise yoga on the morning of the summer solstice at Times Square in New York, the United States, June 21, 2010. Thousands of yoga enthusiasts got together during the eighth annual "Solstice in Times Square" event to celebrate the longest day of the year. (Xinhua/Shen Hong) (zw) Xinhua News Agency / eyevine 00491294

(100621) -- NEW YORK, June 21, 2010 (Xinhua) -- Yoga enthusiasts practise yoga on the morning of the summer solstice at Times Square in New York, the United States, June 21, 2010. Thousands of yoga enthusiasts got together during the eighth annual "Solstice in Times Square" event to celebrate the longest day of the year. (Xinhua/Liu Xin) (zw) Xinhua News Agency / eyevine 00491295

(100621) -- NEW YORK, June 21, 2010 (Xinhua) -- Yoga enthusiasts practise yoga on the morning of the summer solstice at Times Square in New York, the United State, June 21, 2010. Thousands of yoga enthusiasts got together during the eighth annual "Solstice in Times Square" event to celebrate the longest day of the year. (Xinhua/Liu Xin) (zw) Xinhua News Agency / eyevine 00491296

Participants take part in a mass yoga session in Times Square in New York June 21, 2010. The day-long event which attracted hundreds of yoga students over five free public sessions was organized to mark the summer solstice. AFP PHOTO/Emmanuel Dunand