American Football 101
American football is played on a field 120 yards long by 53.3 yards. The longer boundary lines are sidelines, while the shorter boundary lines are end lines. Near each end of the field is a goal line, they are 100 yards apart. The scoring area called an end zone extends 10 yards beyond each goal line to each end line. Yard lines cross the field every 5 yards, and are numbered from each goal line to the 50-yard line, or midfield. Two rows of lines, known as inbounds lines or hash marks, parallel the side lines near the middle of the field. All plays start with the ball on or between the hash marks. At the back of each end zone are two goal posts (also called uprights) that are 18.5 feet apart. The posts are connected by a crossbar 10 feet from the ground.