The TAB below shows you a very simply lick that incorporate a little trill using your little finger, or "pinky."
There are a lot of chromatic finger workouts around, and to be fair they are probably a bit more intense than this, but I've never really been a fan of chromatic exercises.
Not because I don't think they work though.
If you have 6 hours a day to practice then it makes perfect sense to spend an hour or so on "finger press-ups."
But I, like most people, certainly anyone with a job, don't have 6 hours a day to practice. Whenever I have wanted to focus on something like a weak pinky, I have always tried to do it with an exercise that was also a lick I might actually use in a solo.
I have tabbed it out moving up and down the E and B strings, so if you follow the tab, you are giving your weakest finger a work out and practising moving a lick up the neck while staying in one key.
It's tabbed in G Minor for no other reason than it's quite easy to move it a full octave on most guitars.
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