The full form of YOGA is “Your Objectives Guidelines and Assessment”. Yoga is a branch of religious and spiritual traditions, which are derived from the ancient Indian practice of Hinduism. in September 2014 , the prime minister Modi suggested that there should be a day for yoga to influence our tradition and because of that we can aware the people why yoga is important and what is benifit of yoga . so the 1st yoga day , we celebrate at 21 of June 2015 and most of the nations participated thus it became a international yoga day . yoga it' not only to improve physical strength but also mental strength . in ancient our ancestors use to do meditation and they use to live a long age so it proves that because of yoga we can safe ourselves from illness .