I read the book The Talent Code from Daniel Coyle a couple of years ago. It defines talent as the combination of three main concepts: Deep Practice, Ignition and Master Coaching.
The first concept, "deep practice", refers to those moments where you are not only practicing but also you are doing it right. This is the opposite to just repeating note after note, measure after measure without stopping to analyze (consciously or not).
An example of this "deep practice" would be when you finally get those two or three measures that seemed impossible a few days ago, and not only you get them but also you understand them (and by this I mean seeing them in a different way and being able to reproduce them).
Throughout all my years as a musician I have been able to get into this so called "deep practice" a time or two, but have failed to do this consistently.
What are the techniques to get into it? How do you do it consistently?