Whatever is the least rewarding, most hard work drills to do around the training centre, just have him that all day every day for the max amount of hours.... And ban him from the canteen so he has to fill his greedy fucking face all on his own.
No more than 20 mins break every 6 hours.
UK Law: "If you work for more than 6 hours a day, you're entitled to an uninterrupted rest break of at least 20 minutes - for example a tea or lunch break. You must be allowed to take it during the day rather than at the beginning or end."