An idea for a full court version of the shell drill from Chris Jans of New Mexico State.
You might not play these exact rules, but starting full court is a way to add a variation to your shell drill.
I hope it gets you and your staff thinking about ways to improve the drills that you currently use to teach and practice your defense.
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6 on 4 Full Court Shell Drill
You can find out more about the Championship Productions video that this clip is from at this link: High Energy Practice Drills