On the command the players dribble to the 1st cone before stopping and dribbling back to the start (whilst still facing forwards).
They then progress to dribble to the 2nd cone before dribbling back to the 1st cone and so on. Once they complete the relay they run to the back and roll the ball through the legs of their team mates to the person at the start of the queue.
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.