P1 is in triple threat position.
P2 & P3 make a V-cut run looking to receive the pass from P1.
P1 can pass to either side. After passing P1 looks to receive the pass back after making a V-cut run and then shoots a lay-up.
P2 & P3 follow up for the rebound and then all rotate one spot anti so that the drill continues.
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.