Moving the head/upper body

[Rcichon]

Have one Umpire in our assoc. that moves his head and or upper body to 'avoid' getting hit by the pitch.

I've tried to talk the guy into understanding that he is more likely to get struck and hurt by moving his head and he knows it's true but is having a hard time stopping.

Any suggestions from you vets out there? Any drills or gimmicks that have worked before? Any ideas at all to help him cure this ill?