Red player 1 (defender) rolls the ball out to blue player one. As soon as the ball is rolled the defender can go and close the attacker down. The attacker can then pick the ball up and go 1 v 1 against the defender and try and score.
Once the practice is over the players go to the back of their lines and the next two players go.
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.