My daily fretting practice is this:
Going from the top of the neck to the 12th fret using all 4 fingers.
Starting from the 1st string:
1,2,3,4 - 2,3,4,5 - 3,4,5,6 - 4,5,6,7 - 5,6,7,8 - 6,7,8,9 - 7,8,9,10 - 8,9,10,11 - 9,10,11,12 - (then returning to the top of neck in reverse order)
And then going to the next string, until I finish all the 6 strings like that.
I've heard that once bad habits are formed, they are difficult to unlearn.
I want to know if it is necessary to avoid touching other strings when doing this fretting exercise or not.