Do skinny people get their bodies from work outs or diet or from mental and emotional health?

I know a few skinny people that eat like pigs, but they expend a lot of mental and emotional energy in life and at work. I also know skinny people who do crazy crazy crazy crazy crazy difficult work outs to maintain their body. One eats 4 times more food then me but will go on 8 hour uphill hikes when she has spare time. She is skinnier then a model. I know another skinny guy who does 2.5 hours of weight training every day even though he is computer tech CEO who makes more money than a doctor and maybe more than a surgeon too.

Do skinny people get their bodies from work outs or diet or from mental and emotional health?
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