I did a search and didn't find anything on this. Its a cool excersize that my band director had us do in jazz band. What you do is move up and down a scale step wise, example (Fmaj): F G A Bb A Bb C D E D E ect. and just keep going up and down, thus "never ending".
I do this starting in the middle of the fingerboard, so in F the 8th fret on the A string. From there I move through the scale going up and down the neck, highest note in the scale to the lowest, trying to stay away from paterns. I find this really makes you think and learn the fingerboard instead of using your usual patterns. Go slow at first, as slow as you need to not make any mistakes. Play a quarter note, rest, quarter and so on if you need, then move on to all quarters, all 8ths ect. Then make it more musical by using different rhythms and rest, again start out easy and slow.
Once you've got a handle on that scale mix it up, for example play four bars of F maj then four bars of Bb major. Now you have to think even more, and that's good! If you can handle that add different key changes. Be creative! I use a drum machine and loop pedal with the chords of the scale/changes, though you could do this with a friend, garage band, finale notepad ect.
There it is, hope I explained it clear enough. Any suggestiions or questions are much welcomed. Ok, now go practice!!
