Chords are a cool thing on guitar. Joe pass called his chords "grips" and I can see why. 
 
1.) Take 3 or 4 note 7th chords and play thru a 12/16 bar progression. The point is stamina. Play it as long as you can till you forearm starts cramping up. Take note of when you first started feeling discomfort and mark that time.  Do it using a bossa or swing rhythm. You don't need any accompaniment but I suggest at lease a metronome. That time you noted is your practice time. Once a day for that time period.
 
2.) For chords you feel unfamiliar with there is a way you can make them easier to master. Take the form you have problems with and form the chord but hold it for 30 seconds and release. Make sure you're not using too much muscle power to hold the notes down. Shake it off and do it again. In no time that chord form will no longer be a problem
 
* this is a stamina exercise. It is intended to give you freedom to play without muscle fatigue. Don't complicate it or waste time by analyzing it or over thinking it. DO it and you're done
 
 
 
My routine for today goes like this;
1 chord per beat - G^9 - G6 - E9 -E7b9 - A13 - A7 - D9 - D7b9 - G^7 - G6 then repeat. Modulate to Bb then to Eb till you complete the cycle of 5ths. Once you have what you want to play you're exercise is ready to use. Do it at least 6 weeks 
 
 
P.S. an excellent book on this subject was published called Jazz Guitar Vol.2 by Ronny Lee Mel Bay I think

I like C-Am-F-G I think I can make a hit out of it.

If you don't do as  Bapu I and says your kids get one of these!

 

bayoubill
Chords are a cool thing on guitar. Joe pass called his chords "grips" and I can see why. 
 
1.) Take 3 or 4 note 7th chords and play thru a 12/16 bar progression. The point is stamina. Play it as long as you can till you forearm starts cramping up. 

After not playing for a few years, I tried this on Friday and the pain point could be noted in measures not minutes! 
 
I like these routines and tips though, keep 'em comin' Bill! 
 
Joe Pass, king of the partial chord.  It should be noted that I can play Am for hours on end! 

(.)<---non-controversial period about practicing with poor L.H technique!  

After not playing for a few years, I tried this on Friday and the pain point could be noted in measures not minutes
 
It's a stamina thing at first. You have to do it in bits and then put what you can do together
All the chords are shown above. 
 
try this Craig - play G Maj 7 4 beats followed by D9 four beats and repeat till you feel it. Stop for 30 sec and do it again. Then add C9 to the progression etc. till you've built a I VI II7 V7 in the key. Next step is to sub Maj 6 chords for Maj 7 chord and Dom7b9 for Dom 9
 
Ex. G^7 - G^6 - D9 - D7b9
       /  /     /  /     / /     / /     

I VI II V7 I  I7 to new key which in this case would be where the V7 chord was going 
Ex. G^7  G^6    E7#9  E7b7    A7b5  A7    D9  D7b9    G^7(or^6) G7     new key
 

Eventually work up to 4 times thru the circle of 5ths and that will keep your chord chops in good working order. It's doesn't take long and I do it every morning as a warm up

The goal is to repeat the exercise with 1 chord per beat thru the cycle 4 times at a moderate speed. That will take time but if you hang in there,even if it's only 5 minutes, you WILL benefit from it. Once it becomes a daily routine you will see a huge jump in the strength and dexterity of your fingers