What's the proper technique for fretting chords on a guitar to prevent hand cramps?

First hold your left hand (or fretting hand) in a relaxed position. Extend your thumb to your pinky and then pull them apart slightly. Continue this motion with the rest of your fingers: ring, middle, and then your index finger. Repeat as many times as you want, but don't over-exercise your muscles.

1. How do I stop my hands from cramping when playing guitar?
2. Why do my hands cramp when I play guitar?

How do I stop my hands from cramping when playing guitar?

5 Ways for New Guitarists to Reduce Hand & Finger Pain

1. Start Using Lighter Strings. When starting out, the chances are you're using the guitar strings that came with your guitar. ...
2. Warm Up Before You Play. ...
3. Practice Your Technique. ...
4. Holding the String Close to the Fret. ...
5. Use Guitar Finger Caps or Gloves.

Why do my hands cramp when I play guitar?

This can be frustrating, but not a sign of a deeper problem. Sometimes switching to lighter strings can really help with this, or tuning the guitar down the ease the string tension. But the fact is, calluses take time to build and the fingertips might hurt some in the process. This is normal and to be expected.