2 Lines: OFF/DEF
Throw the ball randomly out and have the first person in each line hustle to the ball.
If OFF gets it the defense gets in position and defends 1on1.
If DEF gets it they make a good hard pass to the coach.
Then both players switch lines.
This drill is designed to see your team hustle to the ball and defend in transition. Also you want to see the offense be aggressive and get to the rim. Def needs to make good hard passes if they get the ball.
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.