What do the Olympic Games have to do with ancient Greece?

They were a four-yearly religious festival started in 776 BCE to honour the god Zeus. They were held at Olympia in southern Greece. After a thousand years, they had become so commercialised ad politicised, the Romans, by this stage in control of the Greek world, closed them down.

They were resurrected in the modern era as a straight athletics/sporting competition by other European countries in 1896, and have continued every four years in different countries around the world.