This post contains a videos of a defensive drill from North Carolina’s Roy Williams.
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Mine Field Drill
You can make adjustments to the rules and requirements of the drill that fit your team.
If you are interested in finding out more about the DVD that the video sample came from, click here:
You might not want to run this drill exactly as Coach Williams does, but it might give you an idea to repurpose something that you use, or take his scheme and tweak it to meet your philosophy or defensive rules.