A kickoff in football is a type of kick that is used to put the ball into play at the start of a game, at the start of the second half, at the start of overtime, and after a score. Kickoffs will happen after touchdowns, field goals, and safeties. A return will always happen on a kickoff by the receiving team. Kickoffs are performed behind restraining lines. The restraining line for the kicking team on a kickoff is the 35-yard line and the 45-yard line for the receiving team. A legal kickoff is one that goes ten or more yards. An onside kick is a kickoff that goes the minimum distance and is designed to be recovered by the kicking team. Safety kicks are kickoffs that happen only after safeties are scored. The restraining lines are different on safety kicks.