Indian schoolchildren participate in a yoga session at a school in Chennai on June 20, 2016, on the eve of International Yoga Day. 4001 schoolchildren participated in the demonstration. Yoga, which means union in Sanskrit, is a family of ancient spiritual practices and also a school of spiritual thought from the South East Asian continent, where it remains a vibrant living tradition and is seen as a means of enlightenment. / AFP / ARUN SANKAR (Photo credit should read ARUN SANKAR/AFP/Getty Images)
