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Along with the thumb thing, you could tap your thumb with each finger as fast as you can going back and forth.
On your guitar you could press down on the first fret really hard and hold it for 5-10 seconds. Then put your next finger on the second fret, while keeping your first finger where it is and press down. Continue until all your fingers are stretched out. Then go down the strings doing the same thing. To add to this, but is difficult at first, is after you have all your fingers stretched out, try moving your first finger down to the next string while keeping your other fingers where they are. Then the same for you next finger until all your fingers are stretched out on the next string down.
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