Rolling off a blockout is used to gain a good position for offensive rebounding.
The player gets around the defender by turning, pulling around. Player goes back to back with defender then continues to turn taking on long side step around defender so defender left behind.
Go up for the rebound.
Repeat 10 times on both sides of the board and rolling clockwise and anti clock wise around defender.
This practise can be done with a defender or as a shadow drill individually.
In rebounding position, knees should be bent, back bent, elbows up, hands open and palms down.
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.