The Sokol /or Falcon/ athletics body -a physical exercise organization founded in 1862 during the Czech national revival - is holding its 14th all-Sokol meeting at Prague's Strahov stadium this week. Some 18 thousand gymnasts of all ages from all over the world are taking part. The Sokol athletics body is one of the oldest organizations in the world. Its modern era began with its revival after the fall of communism, but even during the dark period of Czech history ex-pats around the world kept its spirit alive. The all-Sokol meeting takes place once in six years.