As a classically trained cellist, there's an important aspect to playing guitar that I notice most people neglect. To make sure chords are played correctly, it's very important to have your fingertips pushing directly down on the string, not the flat front part of the finger pad. Keep your nails short, and try doing fingertip pushups (be careful and don't break anything!).
Pretty much anything that works on your grip strength with help as well. Try getting a dowel and attach a string in the middle.At the end of the string tie a weight, and hold the dowel in both hands and wind the string up until the weight touches the dowel. Try turning the dowel in both directions.
Overall, finger strength (make sure it's fingertips!) and grip strength can be achieved through practice on the guitar. Keep it up, and keep on rockin' in the free world!
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