White player 1 starts with the ball and proceeds to pass the ball up the line to the next player and so on.
Blue Players 1 and 2 are defenders and can start once the 1st pass has been played. They have to run to protect the basket and stop the white players from scoring.
On reaching player 4 the white players 3 and 4 move forward with the ball and try to score.
After playing the point out the white players 3 and 4 then become defenders and blue 3 and 4 join the queue of attackers on the other side of the court.
Don't allow the defensive rebounders to run until 1st pass has been played.
To make it harder you could make the defensive rebounders face their own basket before then turning to run up the court.
Stress that the defenders should try to box out the attackers with body contact.
Good team defence is five players guarding the ball, not five separate one-on-ones. The shell drill is where that starts, so here is how to teach help-side positioning and rotations from the first week of the season.
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.