The Olympics are not actually not a sport but is a ancient competition but its been popular in Greece since 3-5000 years a go.
most people reckon that swimming is the best sport in the Olympics
the javelin throw & discus
Sports have been around for thousands of years. Ancient civilizations had sports. The Olympics comes from Ancient Greece.
Probably track and field, since it has been in the Olympics since the original games in ancient Greece.
Since the very first Olympics which took place in ancient Greece. It was considered a "hunter's" sport.
i say any sport in the Olympics since Greece stared the Olympics and they are an old country
The most popular sport in Greece is soccer or as they call it, football
running EDIT: There was no main sport thay just played all the sports that existed.