Can hunching my back hit my kidneys?

The position, sustained, may impact circulation to muscles and bladder/ureters/nerve sensation. if you know this does this, then stop. drink more water, fluids, a little bit of urine is not enough. Is it dark yellow? if so, dehydration or renal damages in progress. kidneys are under lower ribs. You're overstressing body/circulation impairment. Even repetitive typing causes sore neck muscles/carpal tunnel sx etc.