Everyone starts with a ball and finds a partner. Each pair will need a ball each and they have to dribble around within a suitable area whilst holding the hand of their partner.
The coach nominates people to be the catchers. These people can dribble around freely (without having to link arms) and try and tag someone. If they do then the person they tag becomes a catcher and they take their place.
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.