Productive people (people who consistently produce things of true value) aren’t productive because they’re “disciplined” in the modern sense of that word – at least not in the sense of being skilled at kicking their own butts to force themselves to do something they really don’t want to do. They’re disciplined in the older sense of that word, back when people remembered that it had some connection with the word “disciple”. Productive people are productive because they love whatever they do as much as St. Peter loved Jesus. They do it whenever they darn well please, thank you, which tends to be quite often - since they love what they do, they don’t have to force themselves to do it.