Here is how you can defend specifice actions.
The following 4 frames are an example of a specific offensive actions to
defend. The key is to select the movements that your opponents use in their
offensive schemes. Defending the specific cuts and screens that your toughest
opponents run throughout your entire season of practices is more effective than
only working on those movements the night before you play.
Having the offense run specific sequences helps to make your 3 on 3 drills
more gamelike and less like a summer 3 on 3 tournament.
Come up with your own list of what you need to defend for the teams on your
schedule and work on defending them with your defensive rules. The following
four frames are a place to start.
Flex action: back screen, down screen.
Down screen, cross screen. 1 down screens first, then screens
Princeton Action: Backscreen / flare screen
Princeton Action: Flare screen