Need to anticipate where the ball is going to go and the speed of the ball.
Stand about 2 meters from the basket.
Toss the ball up to the rim simulate a shot.
Jump and rebound the ball.
Ensure the toss hits the rim and not the backboard to accurately simulate a shot.
Chin the ball every time and your elbows are up.
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.