I'm interested in working towards practicing 8 hours a day now that I'm on winter break from school. That being said, I have two questions:

1. What are some ways to improve endurance? For those of you who can/do practice/play for 6 or more hours a day, do any of you focus on endurance or focus on doing anything to improve it?

2. What other types of workouts do you guys do related to the muscular side of guitar playing? Where I'm coming from is here; I read about Dominic Frasca and how he lost all function in his hands from practicing too much, only recovering when he started lifting weights along with his practicing. So do any of you do any sort of exercise outside of practice with guitar playing in mind? I've done posture work-outs before (the obvious one) but I'm wondering about anything else or if it is even a big deal at all.

I know it seems like there are obvious answers to these questions but I wanted to see what people had to think about them anyways.
1. All you can really do is play more. The more you play, the longer you'll be able to play.

2. There isn't really a muscular side of playing guitar. It doesn't take a lot of strength to play. The only aspects where strength is a bit involved is chords (barre chords specifically) and bends and vibrato. Everything else is more based on your accuracy and technique rather than strength.

The best advice I can really give you is to just make sure that you are using proper technique. Play with the minimal amount of force required. Nothing more, nothing less. And keep your your fingers as close to the fretboard as you can. Why move 2 inches when an eighth of an inch will do?
Quote by Geldin
Junior's usually at least a little terse, but he knows his stuff. I've always read his posts in a grouchy grandfather voice, a grouchy grandfather with a huge stiffy for alternate picking.
Besides that, he's right this time. As usual.
To develop endurance, playing a lot helps.

Aside from that, good technique helps massively. If your fingers make half the motion, not only will you be able to play much faster, but you'll be using much less effort and will be able to keep playing for longer.

Also, any kind of excess tension is terrible for endurance. Stiff shoulders, tense forearms... they all massively affect your endurance.