Two lines of players 1 ball.
Player 1 passes the ball to player 1 whom moves onto the ball catches the ball and does a two step lay up, rebounds their own ball and passes it to the next player 1 and goes to the back of the player 2 line of players.
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.