Setup 2 cones at the top of the key player sized space in between.
Start at the top of the 3 point line in front of the cones perform a move in between the cones and drive into the post for a layup rebound and return to the top of the key and do the same starting with the other hand this time. Repeat.
Complete 10 Layups with each hand then move to progression
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.