Defenders also practice tackling when necessary.
Defenders line up in a single file beside the goal post.
Attackers line up in a single file behind the center circle. The defender contains and slows down the attacker until the defender backs up to the penalty area front line. When defender crosses this line, he or she must make the tackle. Key point Until the time the attacker crosses the 18-yard line, the defender backs up. The only time the defender can attempt to tackle is when attacker makes a serious mistake, such as pushing the ball too far in front.