Gymnastics is made up of three disciplines, artistic, rhythmic and trampolining.
Artistic is the more well known of the three, while rhythmic sees gymnasts throwing things like balls and ribbons around to music.
Artistic gymnastic events
Men - Floor exercises, pommel horse, rings, vault, parallel bars and horizontal bar
Women - Vault, uneven bars, balance beam and floor exercises
The most important event in artistic is the all-round, where the scores of all the apparatus are added to each other to find the complete gymnast.
Only women compete in the rhythmic events.
Trampolining is what it sounds like, with gymnasts jumping up and down performing tumbles and spins.
Medals in the gymnastic events are decided by judges, who mark the gymnasts out of 10.
One of the most popular events of the Games is the gymnastics gala, where all the Olympic champions and world champions perform routines for fun. They are often much more modern and unusual than the serious stuff.