A tug-of-war competition at the 1904 Olympic Games in St....

A tug-of-war competition at the 1904 Olympic Games in St. Louis, MO. Credit: Library of Congress

Why do the Olympic Games, which begin on Friday, have the events they have? Why don't they have swimming obstacle races, croquet, rugby or mud fighting?

After all, they once did.

Nowadays, the International Olympic Committee reviews the program for the games every four years and suggests only minor adjustments. And so we always have track-and-field athletics, swimming, gymnastics and a steady roll call of 26-28 other sports. Such was not always the case.

Until the mid-1920s, the events were chosen ad hoc by the local organizing committees. Only track-and-field athletics, cycling, fencing, gymnastics and swimming have been on the program every time since 1896, when the first modern Olympics was held. Even within those sports, the events have varied widely.

The Olympics of 1900 and 1904 share the honor of hosting the most unusual sports. Both games were held as sideshows to world's fairs -- the Paris Exposition of 1900 and the Louisiana Purchase Exposition of 1904 -- and therefore lasted several months.

In 1900, a series of obstacles was set up in the Seine River in Paris. Swimmers lined up for a 200-meter race in which they had to climb over a pole and a row of boats, then swim under another row of boats. That was the only time the 200-meter Obstacle Swim Race was contested at the Olympics.

Also in 1900, cricket was contested for the only time at the Olympics. The match was purportedly between French and British teams, but the French contingent was actually composed of British expatriates working in Paris at the time. Croquet also was played in Paris, then replaced in St. Louis in 1904 with a variant known as roque. Roque, played with smaller balls and much tighter wickets, was hailed as the Game of the Century in 1904, but only four Americans competed and today it's essentially defunct.

The organizers in 1904 also had the effrontery to conduct a two-day experiment called Anthropology Days. The exhibits at the fair were designed to demonstrate the progress of humanity from barbarism to the pinnacle of Anglo-Saxon civilization, and this was exemplified by exhibits contrasting various races and peoples, including American Indians and Philippine natives.

The fair organizers thought it would be good to incorporate indigenous sports, as well as other more common ones, though this served mainly to mock them. The native peoples -- including not only American Indians and Filipinos but also Africans and Syrians -- often had no knowledge of the sports they were asked to attempt, which included sprinting and shot putting, but also throwing bolos, mud fighting and climbing a greased pole. Pierre de Coubertin, founder of the modern Olympic Games, later called the Anthropology Days an "outrageous charade."

Other Olympic sports since abandoned were simply intended to be competitions among all available athletes. Tug-of-war was quite popular, being held in 1900, 1904, 1908, 1912 and 1920, before falling from the program. Lacrosse was contested in 1904 and 1908.

In 1900, 1908, 1920, 1924 and 1936, polo was an Olympic sport, falling from grace only after Berlin in 1936. It was the last sport to have been discontinued, until baseball and softball were ousted from the 2012 games. They are to be replaced in 2016 by golf and a variant of rugby. These won out over karate, squash, roller skating and ballroom dancing -- but neither will be new to the Olympics. Golf was contested at those unusual Olympics of 1900 and 1904, and was on the program for 1908 and 1920, though it was canceled both times. Rugby tournaments were held in 1900, 1908, 1920 and 1924. The United States won gold twice, in 1920 and 1924 -- which is why when the sport returns in four years, the defending champions will be those great practitioners of the game, the United States.

And so it goes. Many sports want to be on the Olympic program, but many more have left the stage. No, the London organizers will not be placing a series of obstacles in the Thames, and asking the swimmers to make their way over them.

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