every olympics games has the same sport
Trampolining has been a medal sport in the Olympics since the 2000 Games in Sydney
Basketball was a demonstration sport at the 1904 Olympics in St. Louis. The first Olympics where medals were awarded was the 1936 Games in Berlin.
It depends on what you define the most common sport in the Olympics as, football is probably the most played sport that is included in the Olympics
At the first Olympic games.
Swimming has been a sport in the Modern Olympics since the first Games in Athens in 1896.
The pentathlon is a modern Olympics sport.
At the 2008 Games, that would be softball.