Split into 2 lines and have a line on either side of the court.
One player in the middle with a basketball.
The player in the middle will pass to the 1st player in one of the lines. After the pass is made that player will go and defender the receiver of the pass.
They will play 1v1. Only 1 shot is allowed.
Once a shot has been taken the ball will be passed to the opposite line where the offensive player will become the defender.
Rebounding is the least glamorous thing in basketball and one of the most decisive. It is also almost entirely a habit, which means it is entirely coachable.
Good spacing is only the start. The best modern offences teach players to attack the defence's rotations and play in a permanent 4-on-3 - here is how to coach that read.
The ball screen produces almost half of all professional offensive possessions, yet most teams still teach it as a memorised play. The modern approach trains the read - giving players a framework to decide based on what the defence does, not what the coach called.