Players start off with their own space on the court.
On the coach's first whistle players sprint on the spot, standing with wide feet and their arms outstretched as if defending.
Players sprint on the spot, with minimal leg raise - emphasis on fast feet.
On the coach's second whistle, players follow the coach's signal (right or left with their arm).
Players move in the crab position in the direction of the coach's signal until the third whistle.
Coach should vary the time between whistles and change direction several times.
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.
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