American Football is one of the biggest North American sports. Whilst the game is played worldwide, the professional leagues in North America (such as the. Join us as we take you through the basics of American Football. For a better video on understanding the. Simple guide to the basics of American football. DOWNS Downs are the most fundamental, and confusing, part of the NFL rulebook. It is very difficult to always avoid violating these rules without giving up too much of an advantage. A touchdown is achieved when a player has legal possession of the ball and the ball crosses an imaginary vertical plane above the opposing team's goal line. Positioned opposite the wide receivers are the cornerbacks. At the start of the second half, the team that did not choose first either because they dragon age 2 gifts their choice or because they lost the toss gets the first choice of options. The winner of the toss may defer their choice to the start of the second half, or they may take first choice of:. The width of the spotted football defines the width of the neutral zonean area of the field no player other than the snapper may position himself in or above before the snap.