You see people who have been very heavy in their life who have taken that body trimmed it down firmed it up through discipline exercise and being able to say no. Eating properly that all comes into it.
He's really sort of the devil. He's completely emotionally detached. He has no empathy. You find that in psychopaths. It's about power with Voldemort. It's an aphrodisiac for him. Power makes him feel alive.