Quote by Freepower
Here you go, free of charge, a short lesson on posture.

Click the five in my sig!

I was lucky enough to discover classical positioning early on to play the higher register
of the guitar, but tense shoulders has been a recurrent problem, your solution seems pretty neat, I'll be trying it out later, peace.
I never really thought about posture when play guitar. I tend to play more relaxed anyways so It doesn't effect me much but it'll certainly make me more aware.