I'm afraid that you misunderstood. I was the one wasting time with you. You're clearly having a problem with maintaining a fitness habit. Don't blame me if don't like the reality. I'm just giving you the cold hard truth everybody else tries to sugarcoat.
Heh, you don't know me, and I don't have a fitness problem. I spent two months this year fighting and training muay thai in Bangkok. That includes waking up at 5:30am and running 6k before padwork/bagwork/sparring, and then training again in the afternoon. That's the lazy fighters regimen, pro fighters are required to run twice that. At home I train 4-5 days a week. My vacation is literally going to Thailand for fight camps.
You know how I know you're full of it? Its the bullshitter's law: the amount of knowledge a person has is inversely related to how well they claim to know a topic.
Since you already know everything about motivation and achievement, there's nothing for me to discuss here with you. Everyone is weak and stupid except for you.
Discipline is only a small part of the answer and IMO the wrong place to start with, especially for people who have never had good fitness habits.
What's more important is finding activities that are naturally motivating and fun to do. These habits are far easier to build when they are more rewarding.
And then you naturally build discipline because the cost of missing out becomes more expensive to you.