UN and about 200 nations celbrate Yoga Day on 21 june. Its really we try to feel our soul n body in right shape n functions. The science is only works on material body but not on soul. Its not possible by any means to work on soul but Yoga is the way if it taken by n in under right GURU(Master). Soul starts working on body n helps in detoxic of body n cure n help in curing body. Lots of research in medical sci under taken n gone for proving yoga sci. then after that UN accept International Yoga Day.