[tag]American football drills[/tag] include a technique used to help lineman understand how far their blocking assignment should be taken.American Football Drills

What you need – You can set up an offensive line against tackling dummies first, and you can put a running back in the backfield.   Later, you can add in the real defensive line.

How this drill works – First, as every good [tag]football[/tag] [tag]coach[/tag] would, you have to lay an elaborate story about how the lineman have a national television camera on the back of their jerseys, and the only way for the world to see how good they blocked (and how good the RB is) is to maintain their block, and to turn their body to seal the hole for the running back – so the camera stays on the running back.

For example:   if the RB is moving through the 2 hole (between center and guard) their blocking assignments will likely be the middle linebacker and the defensive tackle.   So once they open the hole, they should stay with their blocks and seal them off so the running back doesn’t have to worry about players catching them from behind.
 
Result – the running back has a clear hole to run through, and the offensive line stays with their blocks until the play has ended.   The cameras need to stay on the RB!