USA

Considered the largest Olympic power, the USA lost supremacy to China at the Beijing 2008 Olympics. After rebounding at London 2012, they are expecting to stay on top in Rio

Athletics

Origin
Athletics are among the oldest of all sports and their roots can be traced to the ancient Greek Olympics.
Rules and Objective
The three main athletic events consist of running, jumping and throwing.

Swimming

Origin
It has existed since the Stone Age, but only became an organised sport in the early 19th century.
Rules and Objective
Swimmers start from blocks after the starting pistol is fired. Backstroke is the only stroke where swimmers start in the water rather than blocks.

Shooting

Origin
The sport has been practised for hundreds of years, and been included as an Olympic sport since the first modern Games in 1896
Rules and Objective
The score in the final round is added to the qualification round to determine the winner.

Freestyle Wrestling

Origin
Possibly the world’s oldest competitive sport, wrestling dates back to 3000 BC. Freestyle wrestling was first included at the St Louis 1904 Games.
Rules and Objective
Wrestlers win by either pressing the opponents’ both shoulders down on the ground or scoring 10 points more.

Diving

Origin
Competitive diving was developed from gymnastics in Sweden and Germany in the 18th century. It became an Olympic sport in 1904.
Rules and Objective
All the scores are added up except the highest and lowest scores, and then multiplied by the degree of difficulty of the dive.

Boxing

Origin
It was accepted by the ancient Greeks as an Olympic game in BC 688, and has been contested at the modern Olympics since 1904.
Rules and Objective
Boxers are scored on successful landed blows, domination over an opponent, competitiveness, technique, tactics and adherence to the rules of the sport.

Artistic Gymnastics

Origin
Introduced at the first Olympic Games in 1896 in Athens. The term was created to distinguish free-flowing styles from techniques used in military training.
Rules and Objective
Judges score the athlete’s performance by the difficulty and technical quality of the athletes’ moves.

Rowing

Origin
The all-time Olympic discipline began as a sport in the 17th and early 18th centuries, with the Oxford-Cambridge university boat race.
Rules and Objective
The two main types of rowing are sweeping, where rowers each use a single oar, and sculling where they use two.

Basketball

Origin
Created by Canadian physical education professor and instructor, Dr. James Naismith, in 1891, and originally played with a soccer ball.
Rules and Objective
One team can only hold onto the ball for a maximum of 24 seconds before they must shoot. If they fail to shoot they lose the ball.

Tennis

Origin
The modern game was born in England in the late 19th century. It returned as an Olympic sport in 1988 after its withdrew in 1924.
Rules and Objective
Each match is the best of three sets except the men’s singles final, which is the best of five sets.