Player 1 starts with the ball in the middle of the court and plays the ball to player 2 who cuts in to the first cone.
Player 2 must then pass to player 3 who has also made a run inside to the other cone further up the court.
Player 1 in the meantime should loop on the outside behind player 2 to receive the ball back from player 3 and take a shot.
Player 2 and 3 should follow up for any rebounds.
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.