If you play finger-style guitar, then you will need to work out some kind of strum pattern that helps loosen your fingers up on your strumming hand (i.e. right hand if you play right handed). Maybe in the future I can post some suggestions for that.
Your fretting hand (left) will need to be loosened up as well. I find that my ring finger and pinkie finger are usually the stiffest. Exercises on the fretboard that involve all of your fingers, especially the ring and pinkie fingers, will be beneficial. Even switching back and forth between several chords that you know for a few minutes will probably help as well.
Stay tuned for more specific suggestions.
Feel free to leave a comment or email me at nativeguitarjoe@gmail.com