Red 1 shoots a free throw. Players O1, O2 and O3 rebound the ball, fill the lanes. Red 1 plays defence. 2 cones at the halfway line. The wing players must go around the cones. After finishing fast break the shooter becomes defender and 3 players goes against 1 to the opposite basket.
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.