They actually didn't wear anything. That's why no women was allowed to watch or be in the Olympic Games.
Yes, that's right -- ancient Olympic sportsmen (all men, by the way) ran, wrestled, and fought buck naked. The ancient Greeks had a tradition of doing things nude (they walked around in the buff in the bedroom and at parties called sympsia*, and they exercised without any clothes on) -- indeed, the word gymnasium came from the Greek word gymos, which means "naked."
Why naked? Well, to appreciate and celebrate the male physique, of course, and as a tribute to the gods. Participants regularly anointed themselves with olive oil to enhance their looks ... and to keep the skin smooth!
In the sixth century, there was an actually attempt to make athletes wear loincloths, but this proved to be unpopular and soon afterwards nudity regained its status as fashion in athletics.
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Male athletes who were Greek citizens.
The olympic games were held in honour of Zeus, king of the Greek gods. He and the other gods lived on Mount Olympus
You had to be 7 or older to compete in the Ancient Greek Olympic games
Women in Ancient Greek were considered inferior to men and did not have the same rights. For that reason they were not allowed to participate in the Olympic games.
Individual entries - had to be a citizen of a Greek city-state.