just do this a couple times and you'll have really strong fingers

G:|-------1-2-2-3-------------3-4-|
D:|-----1-2-----2-3---------3-4---|DO THIS A COUPLE TIMES
A:|---1-2---------2-3-----3-4-----|
E:|-1-2-------------2-3-3-4-------|

P.S.use finger and frit number to play this