Kolkata, June 21: Prime Minister Narendra Modi on Sunday advocated the utility of yoga in not only boosting personal health but also acting as a catalysing agent in opening up the path for world peace. Addressing the nation on the occasion of the 12th International Day of Yoga celebrations at the Red Road in central Kolkata, amid thousands of participants, Modi underscored the need for a balanced personal lifestyle that yoga teaches. He also emphasised the need to embrace the tradition across all ages.