Set up as shown in video clip.
Position 1- Close Out and guard the ball.
Position 2- Deny the ball
Position 3- Front the post
Position 4- Help side defence
Position 5- Sprint out deny the pass
Position 6- Sprint to help side defence
Position 7- Bump the cutter and play 1v1 from the top of the 3 point line.
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.