Building off of Cover 3, I wanted to discuss a few variations of Cover 3 that are great adjustments for teams to make while running it as a base coverage. During the explanation of these coverages I will use a 4-3 Base Defensive Front.
Bunch routes run vs. normal Cover 3:
Running switch allows the defense to change the responsibilities of the Safety and Sam, while showing a different pre-read snap to the QB (a 2 high look). The $ can pick up the Sit route seeing it in front of him, and the S can pick up the Arrow route. Here is an example:
Simple adjustments like this will provide the defense with the upper hand, and allow the defensive players to play more aggressively.
Coming up next.. Cover 3 Cloud