The animation on the left demonstrates a great exercise if you're into that kind of thing. A fellow guitarist showed me this years ago, and it really was a breakthrough in my learning. The idea is this: pick a region of the neck (higher up at first where the frets are closer) and assign two frets to your middle fingers (shaded). Your index finger is allowed to play the two frets indicated and your pinky has its own fret. Now play your major scales, each time going up a half step. In other words, if your starting scale is C, then go to C#, D, D# etc., until you arrive back at the original scale — ALL WITH YOUR MIDDLE FINGERS ANCHORED TO THOSE SAME FRETS. I have animated four scales here, there are twelve in all.

This exercise stretches everything — tendons, ligaments, fingers, brain, knowledge, know-how— and also should reveal to you that all scales are everywhere at once on the fretboard. As you get better at it, start moving down the neck (pitch-wise) where the frets get further apart. Speed is irrelevant, smoothness paramount.