So in the NFL now, on kick-offs, the kicking team has to wait for the ball to be kicked before they start moving.
They used to be able to line up behind the line and get a running start. Now they stand at the line and wait for the kick.
That is really going to reduce the odds of recovering an onside kick. Which, despite my lack of love for the kicking game in general, I've always found to be an exciting play.