[QUESTION] Any tips for playing guitar standing up?

I鈥檝e been having a bit of a problem with this. I play standing up and my entire left arm is sore. This only happens with my les paul for some reason but its completely fine when I use my strat or tele. Am I supposed to move the guitar to my right a bit? (Thats what ive seen some people do anyways) Currently it is flat in front of my body. I tried to move it right but then it just goes on top of my hip bone and it will not stay in that position plus it hurts. My wrist hurts as well and I鈥檝e tried many different heights but none of them work. I angle up the neck and it feels better but it would keep falling back down. Any help would be very much appreciated. 馃檪

Edit: my LP has no weight relief so thats why it might be harder also? (LP signature player plus)

submitted by /u/Balance_Double
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