Yeah this is the reason I never completed OOT OR MM remakes on 3ds, and the reason I have used my switch undocked for a total of 30 minutes. Uncomfortable, and awkward to hold for any extended period.
I have a New 3DSXL. For some reason, the form factor really made my hands cramp up if I played too long, despite never having the problem with the DS Lite. So, one of the first things I did was get a grip. Mine is the Cyber Gadget brand. There may be better ones now. Or not, I dunno, the 3DS is basically finished as a platform, right?
Anyway, the second part is trickier, and that's simply finding some method of playing. For me, I sort of rotate frequently from side to side, to back to belly, like every 20-30 minutes.
Put a pillow under your chest to help prop yourself up. That's how I game on a mobile if I'm lying down. The pillow helps take the pressure off your elbows.
BikesBurgersBeer t1_itrkm4p wrote
ProTip: If your playing while laying on your back, don't drop it.