One week to concert. Everything is in place, you started practice the pieces well in time (miraculously). But you can't just quit practicing the last week, can you!

In this luxuary situation, I find myself sitting, while practicing, thinking about anything but music. My thoughts are wandering, because my impatient mind don't want to be bored.

So today I remembered a thing that I used to do many years ago; play with my eyes closed. It was remarkable how this simple change of circumstance enhanced my practice.
I listened with much greater care, and technically, it gave me a very detailed experience of what in my playing that was relaxed and what was not enough relaxed.
There must be more simple methods like that!!!!
I'm not a fan of "tests" like "playing without warming up" or "playing while whistling another tune" or "playing while talking to your mother-in-law" or such: I think tests like that is counter-effective.
No, I like to find out more methods to increase focus, especially when you're starting to get bored with the music, but you still have to work with it.
Some are obvious, like:
*play with one hand only (from memory)
*play in extreme tempos
*take new voices to the fore
*no pedal
*flip the nuances and expressions (forte=piano, dolce=brutale and so on)
*playing backwards (in sections of course!)
*play with closed eyes (in mozart and bach and similar, otherwise it's to much jumps to be of any use)
...more??