Discipline is when you do what needs to be done, even if you are in no mood. That’s the reason it’s not the work which is hard, it’s DISCIPLINE.
(Let me answer whether I am a disciplined person!? I am typing this after baking an amazing cheesecake at 9.25PM on Friday, waiting for the clock to reach 12AM so that I can eat two slices. Waiting because Saturday & Sunday are my cheat days. Now you know the answer.)