Participants take part in a mass yoga class to mark the summer solstice on Times Square in New York, June 20. 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.

Ten-month-old Leo Erichsen is held up by his mother, Tatjana Eres of Denmark, as she joins thousands of yoga enthusiasts for a class in New York's Times Square to mark the summer solstice, Wednesday, June 20. Temperatures are expected to be near 100 degrees (37C) Wednesday.

People practice yoga on the morning of the summer solstice in New York's Times Square June 20. The "Solstice in Times Square" event on Wednesday brought out hundreds of participants to celebrate the year's longest day.

People practice yoga on the morning of the summer solstice in New York's Times Square June 20.

Yoga instructor Tao Porchon-Lynch goes through yoga poses in her yoga class in Hartsdale, New York on Monday. At 93 years old, Porchon-Lynch was named the world's oldest yoga teacher by Guinness World Records.

Yoga instructor Tao Porchon-Lynch helps a student through a yoga hand stand in her yoga class.

Yoga instructor Tao Porchon-Lynch goes through yoga poses.

Yoga instructor Tao Porchon-Lynch hugs one of her students after leading a class.

School children participate in a mass yoga session during the inauguration ceremony of the 22nd International Kite Festival at the Sabarmati Riverfront in Ahmedabad, Gujarat, India, Jan. 11, 2012.

School children participate in a mass yoga session during the inauguration ceremony of the 22nd International Kite Festival at the Sabarmati Riverfront in Ahmedabad, Gujarat, India, on Jan. 11, 2012. Around 120 kite enthusiasts from eight Indian states and 74 foreign kite flyers are participating in the festival.

Students take part in an "antigravity" yoga class at the Om Factory in New York on Tuesday, Aug. 16. "Antigravity" yoga makes use of hammocks to help practitioners gain greater flexibility, allowing for a wider range of yoga poses, according to the workshop's website.

Students sit in hammocks as they take part in an "antigravity" yoga class at the Om Factory in New York on Tuesday.

Students sit in hammocks as they take part in an "antigravity" yoga class at the Om Factory in New York on Tuesday. "Antigravity" yoga makes use of hammocks to help practitioners gain greater flexibility, allowing for a wider range of yoga poses, according to the workshop's website.

A student takes part in an "antigravity" yoga class at the Om Factory in New York on Tuesday.

Bernice Acosta and other enthusiasts perform yoga in Times Square during an event marking the summer solstice on June 21, in New York City. Thousands of yogis will attend the free day-long event in Manhattan on the longest day of the year.

Enthusiasts perform yoga in Times Square during an event marking the summer solstice on Tuesday.

Yoga practitioners salute the sun while celebrating the solstice in Times Square on Tuesday.

School children attend a yoga exercise session during a camp in the western Indian city of Ahmedabad January 11, 2011. At least 6,000 children participated, organizers said.

School children participate in a mass yoga session during the third day of 21st International Kite Festival at Sabarmati Riverfront in Ahmedabad, Gujarat, India, January, 11. Around 96 kite enthusiasts from 36 countries are participating in the festival along with 150 Indian participants from ten Indian states.

School children participate in a mass yoga session during the third day of 21th International Kite Festival at Sabarmati Riverfront in Ahmedabad, Gujarat, India, January, 11. Around 96 kite enthusiasts from 36 countries are participating in the festival along with 150 Indian participants from ten Indian states.

Indian students perform yoga postures during the International Kite Festival in Ahmadabad, India, Tuesday, January 11. Kite-flyers from 36 countries are participating in the festival which runs from Jan. 9. to Jan. 14.