Providence College Head Coach Ed Cooley takes some demonstration players through the first phase of his Defensive Fly Drill.
You can use this as the basis for your own similar drill to work on defensive rotations.
You can decide what the next movements that you allow are. One step, one dribble, all the way up to full freedom to move.
I hope it gives you some food for thought on what you can do to emphasize deflections and teach and practice defensive rotations.
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You can find out more about the Championship Productions video that this clip is from at this link: Using Pressure Defense to Get a Winning Edge