Permutations of 4!
Alright so let’s look at the classic warmup sometimes called the 1,2,3,4 warmup. Over the years I’ve read a lot of magazine articles (yes I’m that old and that’s how I used to learn guitar “secrets”) and seen a lot of instruction videos where the “expert” rock star describes his pre-show warmup as the 1,2,3,4s. This is actually a great warmup and this is what it means. Each finger on the left hand is assigned a number. 1 is your pointing finger, 2 is your sign language finger, 3 is your ring finger and 4 is your pinky. Start by playing finger one in the 6th string 1st fret, then finger 2 one half step up on the 6th string 2nd fret, then another half step up with finger 3 on fret 3, then finger 4 on fret 4. Move to string 5 and repeat, move to string 4 and repeat, move to string 3 etc. Generally the exercise is played from string 6 to string 1 then back from string 1 to string 6. The whole process is repeated one half step up, continuously, until we work our way all the way up the fretboard. The first exercise below has this tabbed out so it is easier to understand.