Form a line of 3 people next to each other. Have a 4th player stand about 12 to 15 ft away facing the other 3 players.
Player 4 starts out with a ball & Player 1 also has a ball. Player 4 passes the ball to Player 3.
After Player 4 has released the ball, Player 1 passes the ball to Player 4. Player 4 then passes the ball to Player 2, and simultaneously, Player 3 passes it to Player 4.
Then Player 4 passes the ball to Player 1. Simultaneously, Player 2 passes the ball to Player 4.
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.