Ancient Olympic Games started in 776 BC and happened every four years after that. They were different from today’s games. They had fewer events, only free men who spoke the Greek language could compete, and the games were always held at Olympia instead of moving around like they do now. Here are some games they competed in.
  Boxing
 Equestrian Events: Chariot Racing and Riding
 Pankration
 Pentathlon: Discus Throw, Javelin Throw, Long Jump, Running, and Wrestling
 Running
 Wrestling

Wrestling, the long jump, the discus throw, and chariot racing were introduced a few centuries later than the rest of the games listed.

A truce was declared during the time of the Olympics. Nobody was allowed to carry weapons in to Olympia and all wars had to stop. There were no women allowed to compete or even watch the Olympic Games. They had their own festival honoring the goddess Hera. This happened every five years and the main event was a race of about thirty meters for young ladies.

The Olympics lasted more than a thousand years until the Romans started to take over Greece in second century BC.  The Romans kept the games going but they made everyone lose spirit. In 394 AD, Emperor Theodosius of Rome officially outlawed the Games.
 
 

The Revival

In the 19th century the people's interest in physical exercise returned. Educational changes that were made in the United Kingdom stated that, as the Greek used to say, " A healthy mind comes from a healthy body."  While people were doing that the inventions, the telegraph and the railways, were being brought together. Later in 1876, archeologists found 50 structures and 130 statues in the ruins that were Olympia. This made people even more interested in the revival of the games.

Baron Pierre de Coubertin was one of the many people interested in the renewal of the games.  He proposed the modern Olympics in 1892. Two years later he finally had enough public support to create the International Athletic Congress of 1894 in Paris. They appointed the IOC (International Olympic Committee), and approved an Olympics to be held in Athens, Greece in April 1896.

During these Olympic Games 311 athletes from 13 countries competed. The stadium had enough room for 50,000 spectators. Greek and American athletes won most events, but performances weren't that great. Since those games, except for World Wars 1 and 2, the Olympics have been held every four years. The site of the games is chosen, usually six years before the games were held.