Building up your emotional momentum and inertia(?)

How many times have you heard people say "you just need to pick up momentum" or "we need to carry our momentum into this next project"? I think a lot of us take this to mean carrying a positive attitude or ability to get stuff done quickly/effectively; to 'be on a roll'. I think this is only half of the equation that leads to success/happiness/results...pick your synonym.The other part, the part which I can't seem to figure out a name for is the ability for you to maintain that momentum in the presence of negative external forces. An example that comes to mind for me would be my recent goal to lose weight and generally get into better shape. In the beginning months, I could work out three days in a row but if something interrupted my fourth day, I'd lose that momentum and not work out on days five or six. I still had my goal, but I lacked the ability to absorb the impacts of getting thrown off track and took some time to get going again. Now, four months later, if I miss a day due to an external force, it only affects that day and no more. On top of that, things that would have thrown me off before (like the meeting I have today from 6pm-9pm), I just take in stride and adapt my routine to account for it (working out before work so I don't miss it).

So how does this apply to the rest of my life? In a way that I don't fully understand, it seems that when I keep going towards my goals or aspirations, and the more vivid they get in my head, and the more I get up after being knocked off course, the more of this second half of the equation, this dark energy I seem to have. What's also interesting, is that this dark energy seems to express itself universally in every part of my life and I'm able to take shocks from my internal environment that would have previously thrown me off course, and on top of that, I seek out sources to keep feeding the dark energy and increasing the momentum. By building up the momentum to work out every day, and the ability to absorb the shock of external (okay, and sometimes internal) setbacks without loosing that momentum, I am applying myself harder in other areas of my life like other healthy habits, and in maintaining my environment (keeping the house clean, making sure my laundry is done), and even at work. I guess I'm starting to feel that this dark energy is what feeds your momentum and keeps you going; you just have to figure out what feeds it and then make sure it eats up!