My advise, don't stay long or don't walk long or run long or work long, because you can get many unsolvable with drugs disease and even canser, need change positions and best way for this is sleep kinda like lieing, because minimum force is for legs etc and for all body... And don't kiding with your body with temperatures and over "chemicals", because this is thenmal energy device and not kinda quantized where don't matter how you are you still always okay, because quantum forces stronger bilions trilions times than gravitation kinda...

thanks !