Every four years, the world's best athletes come together for one of the most exciting competitions in sport: the Olympic Games. After years of training, competitors in more than forty different sports win and lose their events, and set new world records, in front of crowds of people. The Olympic Games are more than two thousand five hundred years old. So how did they start, how have they changed over the years, and what have been some of the -most important times in their history?
