I’ve been asked a few times about specific stretches for guitar. Stretching is important before, during, and after practice sessions. In the video below, you can see the stretching routine I use to help me get (and stay) loose.
Next time you practice, remember these stretches for guitar and you will likely notice an improvement in hand/wrist stamina. As noted in the video, do not stretch hard enough to cause pain. That’s too far!