Brazil
most people reckon that swimming is the best sport in the Olympics
The one that was the most successful.
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
Probably track and field, since it has been in the Olympics since the original games in ancient Greece.
brazil is the most successful but spain is the most dominant
Japanese
Gymnastics
Olympics
soccer
swimming
Hockey!