Ben has got me to practice this technique. As I understand it you pick a particular measure in a piece that you are having trouble playing. For 5 minutes you just keep repeating the piece non stop. I think after 5 mins you then go down to 4 then 3 and finally 2. I take the last note from the previous measure play the challenging measure and finish on the first note of the following measure. Hopefully Ben will read this and correct any false assumptions/errors I have made.