Discipline is not one thing.
It is one word; but that does not mean it is one thing.
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Clarity about your true and enduring motivations and values
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Single minded focus
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The ability to block distractions from your awareness
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Pain tolerance and discomfort tolerance
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Pleasure tolerance, the ability to enjoy the goal once it is attained
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Strong imagination that can remember and connect with your desired outcomes and conditions even when they are not physically present (‘Out of sight but still in mind’)
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Strategic and tactical intelligence. (Having a good sense of which plans or behaviors will work best and how they will actually play out in reality.)
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Flexibility, the capacity to adapt one’s approach and efforts to changing environmental conditions
These are just some of the ingredients. Throw them in a bowl. Mix them together. Put the whole thing in the Oven of Real-World Testing and Challenge.
And what comes out may be something that (some) people will label as ‘Discipline’.
On top of this, you don’t need every single ingredient. You just need enough of some of them.
So many possible ingredients. And some of them you already have and are already doing well with.
This is why, although there are titles that may be generically ‘good for discipline’, you still need to be disciplined enough to look at yourself and explore what will be best for your discipline.
In this way, it’s like asking the question, ‘which playing card is best for giving me the complete set of cards?’ Or ‘which card will give me a straight flush?’ Or ‘Which card will give me the complete set of Pokémon?’
In each case, one answer would be: ‘It depends which cards you’re currently holding’. Or ‘It depends which cards you have in your deck’.
What are the crucial factors that you think are separating you from being disciplined?
Or conversely,
Which factors do you think would get you that last couple of feet into the Land of Discipline?
For me, your responses to those questions tell me which program I might recommend.