Ahead of the first International Yoga Day celebrations on June 21, yoga guru Ramdev today held a preparatory session with a large number of his followers and children at Jawahar Lal Nehru stadium, New Delhi. Braving rains, 5,200 teachers from his Patanjali Yogpeeth and other practioners including children rehearsed a 35-minute long "Common Yoga Protocol" formulated by AYSUSH Ministry this morning.