American football, referred to as football in the United States and Canada and also known as gridiron, is a team sport played by two teams of eleven players on a rectangular field with goalposts at each end.
Track and field is a sport which includes athletic contests established on the skills of running, jumping, and throwing. Essentially anything you want to chat about that appears in the Olympics/World/Commonwealth Games.
Boxing is a combat sport in which two people, usually wearing protective gloves, throw punches at each other for a predetermined set of time in a boxing ring.
Cricket is a bat-and-ball game played between two teams of eleven players each on a cricket field, at the centre of which is a rectangular 20-metre (22-yard) pitch with a target at each end called the wicket. The winning team is the one that scores the most runs, including any extras gained (except when the result is not a win/loss result).
Association football, more commonly known as football or soccer, is a team sport played between two teams of eleven players with a spherical ball. Every 4 years there is a worldwide competition between countries called the World Cup.
Rugby Union, commonly known in most of the world as Rugby, is a contact team sport which originated in England in the first half of the 19th century. One of the two codes of Rugby football, it is based on running with the ball in hand.
Tennis is played by millions of recreational players and is also a popular worldwide spectator sport. The four Grand Slam tournaments (also referred to as the Majors) are especially popular: the Australian Open played on hard courts, the French Open played on red clay courts, Wimbledon played on grass courts, and the US Open also played on hard courts.