Stand about 10 feet away from a wall.
Pass the ball around your back so it bounces back on your front side. Once you catch the ball again, you wrap it around your back again and continue the drill in the same way.
Once you get used to it, try increase the speed or distance away from the wall.
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.