The biggest mental challenge Kerry sees is getting young players to value defence at all, because social media celebrates silky work on the ball and never shows someone positioning brilliantly or managing two opponents alone. Defending is just as skilful, he argues, noting the best defenders barely tackle because their positioning does the job, and that fear of a whack on the hands usually traces back to poorly coached body shapes and angles. Watch the full masterclass: Closing and tackling in a zone defence.