American football, alluded to just as football in the United States and Canada, and known as turf, is a group activity played by two groups of eleven players on a rectangular field with goal lines at each end. The offense should progress no less than ten yards in four downs or plays; if they fall flat, they surrender the football to the safeguard, yet assuming they succeed, they are given another arrangement of four downs to continue the drive. Focuses are scored fundamentally by propelling the ball into the rival group’s end zone for a score or kicking the ball through the adversary’s goal lines for a field objective. The group trực tiếp bóng đá việt nam with the most focus on the finish of a game dominates.
American football advanced in the United States, starting from the sports of soccer and rugby. The principal American football match was played on November 6, 1869, between two school groups, Rutgers and Princeton, utilizing rules given the principles of soccer at that point. A bunch of rule changes drawn up from 1880 forward by Walter Camp, the “Father of American Football”, laid out the snap, the line of scrimmage, eleven-player groups, and the idea of downs. Later rule changes sanctioned the forward pass, made the unbiased zone, and indicated the size and state of the football. The sport is firmly connected with Canadian football, which advanced in corresponding with and simultaneously as the American game, even though its standards were grown autonomously from those of Camp. The greater part of the elements that recognize American football from rugby and soccer are likewise present in Canadian football. The two sports are viewed as essential variations of turf football.
American football is the most well-known sport in the United States. The most famous types of the game are proficient and school football, with the other significant levels being secondary school and youth football. Starting in 2012, almost 1.1 million secondary school competitors and 70,000 school competitors play the sport in the United States every year. The National Football League, the most famous American expert football association, has the most noteworthy normal participation of any pro athletics association on the planet. Its title game, the Super Bowl, positions among the most-watched club sporting occasions on the planet. The association has a yearly income of around US$15 billion, making it the most important sports association on the planet.
Teams and positions
A football match-up is played between two groups of 11 players each. Playing with additional on the field is deserving of punishment. Groups might substitute quite a few of their players between downs; this “company” framework supplanted the first framework, which included restricted replacement governs, and has brought about groups using specific hostile, guarded, and extraordinary groups units.
Albeit the sport is played solely by men, ladies are qualified to play in secondary school, school, and expert football. No lady has at any point played in the NFL, yet ladies have played in secondary school and school football match-ups. According to the Sports and Fitness Industry Association, 1,100 of the 225,000 players of Pop Warner Little Scholars youth football are female, and 11% of America’s 5.5 million tackle football players are female. Ladies can likewise fill in as authorities; Sarah Thomas turned into the NFL’s first female authority in 2015.