International Yoga Day, June 21, was declared as the International Day of Yoga by the United Nations General Assembly on December 11, 2014. Yoga is a physical, mental and spiritual practice or discipline that originated in India. In suggesting June 21, which is the Summer Solstice, as the International Day of Yoga, Narendra Modi had said that the date is the longest day of the year in the Northern Hemisphere and has special significance in many parts of the world.