With arms outstretched wait for the ball to come to your hands. As the ball reaches your hands, cushion the momentum by moving your hands to your chest. This will act to shield the ball as well and set you up for making a pass or moving the ball in the direction that you require.
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.