On June 21, 35,985 people did asanas at Rajpath. In 2005, 29,973 students from 362 schools performed 18 minutes of 'yogic kriyas' for surya namaskar in Gwalior.

Earlier, a similar record was set in Gwalior. Marco Frigatti, global head of record verification at Guinness World Records said, "The earlier record was set on November 19, 2005, when 29,973 students from 362 schools had performed a sequence of ’yogic kriyas’ for surya namaskar simultaneously for 18 minutes led by Vivekananda Kendra at Jiwaji University, Gwalior."
Ernst and Young were the official process adviser and validator for the International Day of Yoga. They used a three-layered approach to count the number of participants, performers and the number of unique nationalities at the venue.
The Prime Minister, along with officials of various ministries, schoolchildren, NCC cadets, Army personnel and officials performed yoga asanas at the mega event on Rajpath as part of the celebration for the International Yoga Day.
Source-Medindia