Have cones set up as shown in the image.
Players will start at the 1st cone and defensive slide from cone to cone.
Once the player gets their outside foot to the cone the player will push off of that foot and change direction.
Players must defensive slide and not cross over their feet.
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.