[SubaruPoptart]

My arms really only ever hurt after a 4-5+ hour session where I'm hitting the 90's the entire time, but pretty much I'd just be saying what's been said a lot. Try to ease yourself into the harder songs. Try to stay calm as best you can, is another thing I'd say. Take a lil break when you feel yourself gettin aggravated. I really only ever feel strain or pain whenever I'm getting frustrated or when I enter angry gamer mode.

Slightly unrelated though, I don't really ever feel pain in my arms all too often, like I said really only when the sessions get way too long or when I get very angry. It's my legs that hurt the most throughout. I have a footrest under my desk and I constantly shift back and forth from leaning forward, to kinda leaning back in my chair, feet up on the rest. I feel this is what makes my legs hurt as much as they do, probably on top of just how I sit as a whole.

Advice going off of that? I'd say just find a comfortable position to sit in that's also optimal for playing. Since I do a lil worse when I'm leaning back than I do when I'm sitting up straight, for example.