Have players and cones set up as shown in the video. The player with the ball will hold it in the middle of their chest.
Going for 30 seconds the defensive player must keep their head in line with the ball by staying low and using a defensive slide.
The player with the ball can move how they like side to side between the cones.
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.