John Piper on the Olympics
And I do all things for the sake of the gospel, that I may become a fellow partaker of it. Do you not know that those who run in a race all run, but only one receives the prize? Run in such a way that you may win. And everyone who competes in the games exercises self-control in all things. They then do it to receive a perishable wreath, but we an imperishable. Therefore I run in such a way, as not without aim; I box in such a way, as not beating the air; but I buffet my body and make it my slave, lest possibly, after I have preached to others, I myself should be disqualified.
When Paul wrote these words to the Corinthian Christians, he assumed that they all knew about the games. The Olympic Games took place in Greece every four years without interruption from 776 BC until they were suppressed by the Emperor Theodosius in AD 393 (read more here)