When I practice i normaly do hour sessions. any more and i get some lower back discomfort and it just really irritates me so then i have to get up and do something else and come back and practice again. all in all i practice probably 2-3 hours a day. I normaly either sit on like a piano bench or a fold up chair and i think i sort of hunch over my guitar a little. Any suggestions on how to sit so i don't have to get up in the middle of practice?
just stand up while you practice, pretend its like a gig, it will help you out in the long run. Nobody likes a stiff musician.....

except groupies
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sit up straight maby?
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uh...i practise sitting because i was used to play classical with no strap, but i can also play standing up...

just sit up straight

kudos on the stiff/groupies thing xD
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Go there and watch his short lesson on posture; good posture can fix any number of playing problems.
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honestly, I cant use those stools you see a lot of musicians sitting on. I have a nice comfortable padded chair that I use. It has no arm rests, so my arms' movement isnt restricted. I still try to keep my back straight without an arch. To each his own I guess, but I always feel unstable on those stools, as if I were about to fall.