Legs bent, hold the ball between the legs, one hand around the back of one leg, the other in front of the other, like in the image.
Release the ball, imparting slight upward momentum. Rotate the torso to catch the ball with the alternate arms behind the leg and in front.
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.