Well, if not totally made up, surely proped up from insignificance to a marketing term. In any case, don't give it much thought.
The reality is you will have focus and will some days, be uninspired, slouchly, and under the weather on others. Same goes for the hours of each day.
Now, to improve your general power levels:
- eat well (don't gorge, mostly vegetables),
- sleep roughly 8 hours each day,
- hydrate, and
- exercize
- permit yourself to be lazy when you don't feel like it.
Try also to multitask less, and don't spend time on social media and binge Netflix/Youtube/etc. And check your health from time to time.
If you do those things well enough (no need to go anywhere near pro, or track your progress, or whatever, common logic is enough), you'll do great.
Note that none of those things will work wonders if you totally hate your job - or the people in it. Quit and get another, if that's the case (we're talking suffering though, not some mere dislike for some idiot boss or some project - this happens to all jobs).
Oh, and when you need an extra boost, some coffee/tea will also work wonders.
Am I aware right now? What is the mind aware of? What do I notice? Is there awareness? Am I craving something? Do I have any aversion?
The act of asking any one of these types of questions naturally brings me back to an awareness of right now.
I prefer being in the zone instead - mindfulness, for me, is best done periodically as part of reflection of sort.
The Headspace app is a good aid.