Start in the corner of the court or in a grassy area.
Glide / side step at a 25-30 degree angle to a fixed point 15 meters away.
Drop the trailing foot in the opposite direction to the line.
Change direction 4-5 times, go up and back twice, a total of 4.
Keep body low.
Feet come together but do not cross.
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.