I've attempted the back-front strategy only a handful of times. The main reason for this strategy is to get out of the mindset of front-back that is so common. Since most students don't know how to practice effectively, they tend to start from the beginning each time so the beginning gets more practice time. The middle and end suffers as a result.I do not use this strategy anymore since I don't have the habit of going through pieces from the beginning to end. I focus on practicing the technically intricate areas first and am not concerned with making music during this time. It's only when the technically intricate areas are fine tuned that I work on the easier parts.