I love using the chromatic scale for warmup/technique because the pattern is easy to memorize and I can focus on my right hand. I assign a left hand finger to a fret. So that means….my first finger takes care of all of notes on the first fret, second finger takes care of all the notes on the second fret and so on.
Play through the scale ascending and descending as well as at different speeds. For classical/fingerstyle players, focus on the a finger on the right hand. This finger tends to be the weakest finger and developing that finger will help improve your overall technique dramatically.
I’ll practice this scale:
i-m, m-i, m-a, a-m, p-i, p-m, p-a.
If you are using a pick: down-down, up-up, and alternate down-up and up-down.
You can make things interesting by practicing variations of the scale. For example:
I will do the same thing with a three octave chromatic scale: