The various codes of football share certain common elements. Players in American football, Canadian football, rugby union and rugby league take-up positions in a limited area of the field at the start of the game.[7] They tend to use throwing and running as the main ways of moving the ball, and only kick on certain limited occasions. Body tackling is a major skill, and games typically involve short passages of play of 5–90 seconds.[7] Association football, Australian rules football and Gaelic football tend to use kicking to move the ball around the pitch, with handling more limited. Body tackles are less central to game, and players are more free to move around the field (offside laws are typically less strict).[7]
Common rules among the sports include:[citation needed]
Two teams of usually between 11 and 18 players; some variations that have fewer players (five or more per team) are also popular.
A clearly defined area in which to play the game.
Scoring goals or points, by moving the ball to an opposing team's end of the field and either into a goal area, or over a line.
Goals or points resulting from players putting the ball between two goalposts.
The goal or line being defended by the opposing team.
Players being required to move the ball—depending on the code—by kicking, carrying, or hand-passing the ball.
Players using only their body to move the ball.
In all codes, common skills include passing, tackling, evasion of tackles, catching and kicking.[7] In most codes, there are rules restricting the movement of players offside,[citation needed] and players scoring a goal must put the ball either under or over a crossbar between the goalposts.[citation