The Risk Reward of Pushing Up Against the Line

There's been 12 no balls today 13 in the innings six of them from the last delivery of the over with that out. Australia is still about 130 odd behind at that point something like that if that if broads boots behind the line we're having a very very different conversation by close of play. It's just strikes me as something that that has gone for fast bowlers this is that because they're trying to mark their run up by a centimeter right you know they mark it out to the centimeter well there has been some study on it that even changing the the distance by an inch or so massively change with the velocity and can change the trajectory. There must be something in this anyway