You get four downs to get 10 yards from the original line of scrimage. Thats why you see team will still attack even if it's 4th and 2, 4th and 3. Also, if the position is in opponents territory, said 1 yard to 30 yard line range, sometimes team will take a chance to go for it even it's 4th down. If the attack fails, they dont need to punt it away, opponent assume the field position.
這影片真的太實用了,獲益良多,對了,剛剛查了資料,也有一些隊伍使用室內的球場喔, Atlanta Falcons, New Orleans Saints, St. Louis Rams, Detroit Lions, Houston Texans, Arizona Cardinals, Dallas Cowboys ,Indianapolis Colts