Two offensive players: ball-handler at the wing, shooter in the opposite corner. Two defenders. Ball-handler drives baseline; help defender steps over to stop the ball, then recovers to their man as the kick-out pass comes.
The most important rotation in modern defence. Practise the recovery as much as the help.
Help defender: split-stance, foot in the lane, eyes on the ball.
Step over when the drive starts — don't wait until they're at the rim.
Loud verbal: 'HELP!' on the way over, 'RECOVER!' going back.
Recover with hand high — they're shooting as you arrive.
Don't recover too early or you give up the layup.
Add a third offensive player on the wing for second rotation. Live finish — defenders must contest both the drive AND the kick. Reverse the rotation — drive top vs baseline.