I'm thinking in terms of just developing technique. But if you know a way to do lots of reps on a piece of music, I'd like to hear it. The best I could come up with for a piece of music was repeating a phrase -- I couldn't pull my mind off an actual piece of music.
What I had was a piece of music that I couldn't play -- The technique was beyond me and I got sore quickly from playing it. I realized I could just isolate that one technique and build it up slowly over time. If it was scale speed, I could push the tempo, but I could also push the repetitions and that would help too. Doing lots of repeitions strengethed and toughened up things, so eventually I could play faster.
Most of the stuff I have in mind is very easy technique -- scales, arpeggios, octaves. Things that after I practiced them enough, my mind was freed up. I didn't have to focus on playing -- Yes, after awhile my technique can get a little out of focus, but I just go back and reset the form.
However, if I'm sitting for an hour or two doing these repetition, my mind just zones out majorly. It can even become a sort of stupor. I don't like this of course. I've tried watching tv (which actually works fairly well) or thinking or speaking or reading (I've heard Liszt read books while he practiced). I'm just looking for more ideas.
Why do I do this? I can't argue with the results. Consistency in my playing -- I know what to expect and don't have to worry about some playing technique becoming rusty. True progress over time -- A little bit of work everyday pays off hugely over a long period of time. Also, if I worked on pieces of music, I'd have to wait until I'd learned the piece and the music reading would tangle up things too. For example, instead of pushing my octave speed, I'd be focusing on getting my hands to play octaves over that scale with the extra accident thrown in and that little leap. Another reason -- consistent progress. It is so nice to see that this month I'm playing my scales a little bit faster than I could last month.
This is only part of things. I'm just wondering about this mental glitch during repeition. I hate the zoned out feeling afterward.