Set players up as shown in video clip.
Offensive player will post up on the side of the court the ball is on.
The defensive player will try and stop the pass being made into the post, by half fronting, full fronting etc.
When the ball is passed across the court the players will continue the same thing on the other side.
When the ball is passed into the post, the players will play 1v1.
Start out slow and make sure the technique is right and then gradually increase the speed.
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.